I mean, bosses input reading my heavy attack to suddenly turn their three move combo into a four move combo 50% of the time feels a bit lame. For instance the dancing lion suddenly going into the spray carousel after it would have exhausted its combo and rested otherwise. My main issue is on the inconsistency.

Don't get me wrong, that fight was really fun and I overcame it, but there are many such cases where it feels overtly like the game just threw in the extra attack as a "fuck you" while trying to learn the mechanics. There might be a subtle cue to the boss's body language I didn't see but there's also the issue of the camera in encounters with large enemies.

On the whole though, as frustrating as it may be at times, often there's still an underlying pattern. The only fights I think are explicitly unfair are the ones with adds or multiple enemies that add a lot of uncertainty especially if some are off camera. The twin gargoyle fight comes to mind, as does the Godskin duo where you explicitly have to kill both around the same time or the other respawns.