Tabletop wise, they're basically nixing SoS, right? I thought the revamped Custodes lineup was pointing at eliminating or minimizing them, so figured thats why we got more female Custodes.
They were eliminated over the past year in 30k. They haven't done anything with them in 40k.
Outside the watchers of the throne (honestly very good if a bit weird in the way it covers some events that matter lore wise), a few HH characters (I havent gotten to siege of terra yet) are there any actual SoS focused novels in which they're one of the main characters? I don't just means 'showed up at one point'.
They had one in the Dawn of Fire series(gets mentioned in another book in that series as well but doesn't show up again after basically creating an imperial saint... its a bit weird), Jenetia Krole was in the saturnine launch trailer, as well as sitting at the main war council table with Valdor, Malcador, and Dorn in the latest Dropsite Massacre book(and the only one speaking any sense), Era of Ruin(anthology) had a story dedicated to one(it's actually pretty in depth about her feelings regarding being a null, and then being surprised when guardsmen were happy to see her and receive her assistance). And that's in addition to as I said having them appear here and there throughout the fiction.
It's similar to how there just aren't very many SoB focused novels outside of a short anthology, the Saint Celestine novel I haven't read yet, and technically I guess one of the coil novels by that guy with the weird name where there's actually a very cool SoB (but those novels are so fucking weird I struggle to consider anything in them 'canon' as far as novels go, lol).
Just gimme more militant religious bitches with bolters or greatswords. It's up there with Guard novels for me.
Fall of Cadia is basically split... 50/25/10/10/5 between guard, sisters of battle, space marines, chaos, and random shit like Cawl and Trazyn. They're also heavily featured in one of the more recent Ciaphas Cain books, a couple of the dawn of fire series including Celestine showing up to save the day at one point, Ephrael Stern has her Daemonifuge book(Kyganel fucks off back to the black library right at the beginning of the book), and a couple others.
Most of the modern black library stuff isn't entirely focused on a singular entity or faction these days. That's why for something like the Ahriman series, you get a bunch of shit about Harlequins(and how a solitaire can actually scare a chaos space marine 1 one 1) and Necrons. The Cawl books? Everything from space marines to necrons. Dawn of Fire you get administratum based stories, shit like Illyan Natase back(full blooded eldar this time around), knight houses, guard units, and so on. Hell, one of the more recent Ork books was somewhere around 1/3 admech. Latest necron book has an arbites as a main character, and goes into autistic detail about admech poop trains.
You've got to look beyond what faction/character is on the cover.
I hope they give us more Crime/Horror/Weird Shit novels in the future now that HH is wrapped up. As much as I do enjoy my slog through the HH, I enjoy the weirder one offs like the Ufthak/day of ascension or the bonkers schlock bullshit like Last Chancers.
LOL, they've started The Scouring series. HH isn't over until they say it's over. Hell, they made a book dedicated to the dropsite massacre at the end of last year, having already covered that in the main HH series ages ago already. But now if you want the literal psychic message sent across the galaxy regarding wolves in snow and shit after Istvaan 3 to let everyone know Horus is a traitor, it's been written now.
I mean, i already own an ork army and I cant just hop over and start playing speed waaagh list with 40 bikes in it. I would have to spend money to do that. Too many times I've seen rules that might inspire me to build or play in a certain way only for it to be totally changed in 30 days time.
It's really not that deep.
And some people just already have the stuff painted. I'd assume that to be the case first when someone mentions playing a detachment than having to go out and buy, then assemble, and paint it. People have been in this hobby for decades, what a weird perspective to just assume people have small collections.