I finished this last night. Took me about 40 hours or so. I did everything except a certain optional boss in AotA. I tried him a few times but couldn't be arsed in the end. This is my third or fourth time through the game and I've done him before so I'm not bothered. As I mentioned in another post, if they had ported the achievements/trophies from the original game then I would probably have stuck with it and taken him down, just because, but I wasn't too fussed about leaving him.
It's a brilliant game, obviously, but as others have suggested, for those who have been playing it, and it's sequels, since day 1, I think I'm about done with it now. I can honestly say that I enjoyed playing Hollow Knight over the summer a lot more than I did playing this, but then, in fairness, I didn't know HK like the back of my hand, so the sense of exploration and discovery definitely formed a big part of my enjoyment for it, and of course HK wouldn't exist in the first place if it wasn't for this game.
For Sekiro, From really need to shake the format up a bit, which, to give them their due, it looks like they're doing. One thing I hope they change from DS is how the enemies just stand about, waiting to be attacked one-by-one, and don't move about at all unless you aggro them. From what I can remember, enemies behave in the same way more or less in DS 2 & 3 and BB as well. There needs to be a bit more dynamism to the AI. This is especially noticeable in some levels more than others, like the queue of Taurus and Capra minis in Demon Ruins who just stand about waiting to be drawn and killed one at a time. If, instead, when you come across them they're milling about doing demon-related stuff then it would be a lot more interesting.
I can't be that bored of the formula, however, because I've got a hankering now to go back and play Bloodborne and DS3 again, as I've only completed both of those once. Can't play them in bed though! Everything should be ported to Switch.