I mean, yeah?
Of course you can't convert your save file where you could have save scummed, TPK'd multiple times and cheesed through bosses into a difficulty setting that specifically locks you into no loading saves to ensure you don't save scum your way through the mode.
At best, I could see them putting in the additional boss power into the Custom Mode options (As that's the only thing missing from Custom Mode, which would allow you to simply recreate Honour Mode without the reward from completing a playthrough on Honour Mode. You could even make a harder version of Honour Mode with the additonal settings that hide features of the game)
Did you read my post? I specifically referred to the Honour mode changes. The ruleset. I don't care about converting the save file to honour mode for the sake of cheesing the difficulty for some achievement.
As it is implemented right now I cannot recreate honor mode during an active playthrough because that option isn't available. Even if they added it to the custom difficulty setting page I couldn't access that option because the custom difficulty can't be selected on an already existing Tactician run. You only get to pick between Explorer, Balanced and Tactician if you want to change your difficulty. Honour mode wasn't available when these old save files were made and there are parts of honour mode which are essentially bug fixes, like the exploits they've removed. I shouldn't be forced to start a new playthrough just to get those fixes applied to a save file that was made before I even had any inkling whatsoever that Honour mode would ever be implemented into the game. Again, if Larian decides that they want to give people the option to avoid having fixes applied to their save file, they should have done it through an opt-in toggle. Not lock those fixes behind an entirely new difficulty which forces players to start a new playthrough if they want to have them. I've never seen a game have bug fixes be part of the difficulty selection process.
+1 to this, I'm confused if it's supposed to be a challenge run why people would assume the wouldn't have to restart on a different playthrough?
Because people that were complaining about the lack of difficulty have been waiting for a balance pass to this game for a while and just stopped playing the game with a save file ready at the beginning of act 3 so they could play around with it in a late-game environment, which is exactly where the difficulty of the game falls apart completely. I am one of those people and I'm not interested in starting the entire game over just to see whether the legendary action system they implemented, which should have been in the game on release because that's how 5e bosses don't get left behind in terms of their action economy, is worth its salt. If this was just a perma-death mode, and the rest of the changes could be accessed at any time by just ticking a box in the menu, I would have much less to complain about here. Or you know, what they should have done which is to just patch out these exploits across the board. They literally only made the decision to leave those in to not piss off people that were taking advantage of these exploits but that decision comes at the cost of anyone who actually wants to see these changes manifest in their active playthrough they started before patch 5.