And I think the difficulty adjustments were largely in the number of frames it took Wuchang to drink the healing flask and get up from being knocked down. I believe a lot of players were complaining that getting knocked down was as good as being one-shot since it was impossible to get back up before taking another string of hits from several bosses. I think they changed the animation and i-frames for that.
I stil found it challenging and quite difficult to get heals off in quite a few fights, though. Going off my average death to bosses count, I only found Sekiro, Nioh 2 and the Dark Souls 3 DLCs more difficult out of the 20 or so Souls-likes I've played.