So Tai Yasue (co-director on KH3) conducted an interview with GameReactor at GDC 2019 which was only published recently. In it, he talks about KH3's upcoming Critical Mode and mentioned that they wanted to do everything the 'right way' instead of just simply changing HP and damage values.
What stands out to me though is that Yasue mentioned that KH3's critical mode has new abilities that will "resonate with a more technical playstyle, and also focus on making players think about their actions both inside and outside of battle." Furthermore, critical mode will feature AI adjustments to prevent it from feeling unfair, but it will still push players to their limits and encourage them to utilize the game's full array of options, such as cooking meals to gain stat benefits.
"It is balanced in a way that you could clear it without leveling up, for example, but you really have to think it through. For example, you have to think about the timing of your guarding and using your counter in order to make battles easier to clear."
I'm really excited for this. Critical Mode is seriously starting to sound like a completely different game at this point with what they've been talking about these past few months and I'm down for that.