Completed it, bosses all kinda suck and many feel the same (and moreso are the same.) The only one I liked was Astel and even that's a stretch, though there are a few I would've liked if not for small things that ruin their fights in big ways like Melania's lifesteal, Mohg's triple bleed (I actually did like Mohg, that attack just rubbed me the wrong way,) Malekith's AoEs, Fire Giants camera, etc. and I still hate the Fallingstar Beast in Selia Crystal Caves, it really should be scaled down to half or better yet 1/3 it's size. Endgame areas, despite the cool level design, have really sucky enemy placement and encounters. Didn't really love or hate the open world but I did feel like the rewards for exploring it weren't worth it in the end and legacy dungeons were mostly lame outside a couple of inventive ones.
Armor felt kind of useless in the sense that I was probably still going to die in 2-3 hits anyway so I may as well wear whatever I want. Weapon arts are kinda weird, I used them, but I don't like them, not sure why though. Crafting felt kind of pointless and I stopped engaging with it before the midgame, I would've preferred more merchants and npcs in the game world, though the more I think about it the more I think they added crafting as a means to cut down on merchants and npcs.
Didn't play with magic or incantations, was gonna save them for another playthough but that'll probably be a while off given how exhausting the game is.
Oh and despite having a machine that's 7 years out of date and below recommended specs I experienced no real technical issues other than crashing 3 times, and all 3 were probably caused by me having a browser open with a dozen tabs.