Larian deciding that the player needs to start a new playthrough under a specific difficulty setting in order to get access to bug/exploit fixes and legendary actions is something that goes beyond the comprehension of mere mortals. I made a thread on this topic around the time when the patch dropped.
https://forums.larian.com/ubbthreads.php?ubb=showflat&Number=926014I waited in act 3 in my playthrough because I was bored with how easy the game had gotten, something that actively diminished my enjoyment of the game. So when Honour mode dropped with the legendary action system for bosses I thought that I might finally have reason to come back to the game but nope, Larian comlpetely forgot that some people want those changes to apply to their active playthrough because they wanted to appease people that used exploits. I am honestly pretty annoyed by how myopic they are in their game design deliberations. I don't want to abandon a playthrough 100 hours in just so I can test whether honour mode actually fixed some of the core issues I have with the game later in the playthrough that made me stop playing.