What's sad about the Mouse content overshadowing the original lore is that, people lose sight of the original lore and the purpose of everything behind it.
Take for example, the Dark Troopers. While most lore nuts like you and me remember heavily-armored robot dudes with plasma cannons, arc casters, or blaster shotguns that can easily ice you if you're not careful, what most people remember is them kidnapping Baby Yoda and smacking around Din Djarin like it was the Mountain vs. the Red Viper 2: Electric Space Boogaloo. Then there was them punching down the doors and getting lightsabered by Luke Skywalker.
This, of course, led to people wondering what their real military use is, outside of looking tough:
Which of course, shows that they forgot how the Dark Troopers originally blasted their way into the Star Wars universe:
The Dark Troopers were originally blitzkrieg units. You have an entire city with a fortified, shielded rebel base, blasted into rubble in a matter of minutes. If the regular Imperial army decided to besiege Tak base, they'd have to fight through the city of Talay, engage in some brutal street-to-street fighting, and get through a shielded barricade before burning down Tak Base. That would've taken hours, maybe even days, before Tak Base fell, and the cost would've been dozens, hundreds, or maybe even thousands of Imperials dead, before the base fell into the Empire's hands.
But instead, the Dark Troopers penetrated the rebels' shielded barricade, laid siege to the base, and butchered the rebels inside, as well as any possible rebel sympathizers in the city, with minimal casualties on the Imperial side, if there were any at all. By the time you make it to Tak Base, aside from the local Imperial garrison, all you see are buildings that have been blow open, and the burned corpses of what used to be the rebels there:
That is a potent message to all who oppose the Empire. The fact that this came right after the Death Star was destroyed went to show that the Empire wasn't fucking around; that even though their greatest weapon and the Emperor's most valued lieutenant were both space dust thanks to a lucky shot, the Empire can easily strike back with a new weapon, and the enemies of the Empire aren't safe.
But that's not what the people remember now. Unless they all played the Dark Forces game or its remaster that came out last year, their memory of the Dark Trooper is just that robot that manhandled Mando; a cute little fight, but not much in the way of military sense. They forgot that the original Dark Troopers carried large plasma cannons while zipping around the battlefield with jetpacks:
Mobility, heavy armor, and extreme firepower allowed these Dark Troopers to decimate a rebel base and the nearby city in record time, as Mon Mothma described that the battle was finished within minutes. The main point of making super-strong robots for battle is that you can have them carry heavy artillery as if it were a common blaster rifle, and the jetpacks allow them to zip around the battlefield as a highly mobile version of an artillery unit, essentially giving you a unit that can hit as hard as a tank, can take punishment like a tank, but it moves faster than the most mobile infantry units, thereby making them a nigh-unstoppable threat to all but the most heavily-armed opponents.
I get the distinct impression that if the original Dark Troopers showed up in the Mandalorian, or if the new Mando versions of the Dark Troopers had these plasma cannons, the fight would've been horribly one-sided, and Mando and his friends would've either wound up dead or in Moff Gideon's dungeons somewhere deep in the Mines of Mandalore, getting tortured by the sadistic Moff, either for information or for his own twisted pleasure.
They probably cut the plasma cannons and gave the Dark troopers regular blasters to balance things out and give Mando a fighting chance. But in doing so, they made the Dark Troopers look irrational in terms of a military operation, with people asking why the Empire would spend so much money creating that kind of tough robot while just giving it a regular blaster. At least the Confederacy stuck a rocket launcher into the arms of a B2 Super Battle Droid. And those were just mass-produced mook droids that the Confederacy sent off to die in droves.
What most people and especially game studios forget Imperial Star Destroyers do have guns on their ventral [bottom] side. Although much fewer when compared to their dorsal [top] side. Tantive IV was flying where only the forward guns in the center trench and ventral side had the firing arcs to hit it.
Ventral weapon emplacements are on the terrace sides and along the centerline.
Afaik only the Venator SDs, for reasons, is completely weaponless on their ventral sides.
That's because Venators are mostly aircraft carriers, whereas ISDs are made as battlecruisers for slugging matches. The previous Star Destroyer model was the Acclamator, and it's basically just a glorified Space U-Haul for soldiers with some guns stuck on it, hence the name Acclamator-class Troop Transport.
You have to realize that the Republic was slowly re-entering a militarization phase after 1000 years of pacifism and letting local militaries handle things. The Republic's idea of a dreadnought-class heavy cruiser is less than 1000 meters long. To compare that with the Empire, the Empire's dreadnoughts are ships like the Eclipse-class, which is 17 kilometers long, or the Executor-class, which is 19 kilometers long. And by the time the Empire fully militarized, Han stated in ROTJ that the Empire had plenty of these things. But before that era, we had the Clone Wars, where the Republic was just slowly militarizing, hence why the Venators weren't that heavily-armed when compared to later Star Destroyers.