The issue with Kensei isn't the class. The class is like, 85-95% fine.
The problem is it's forced into using weapons that aren't good. Most katanas have bad scaling compared to the 'good' swords that actually work, or have boring effects that don't ACTUALLY do anything of note.
If I were to overhaul anything, it wouldn't be Kensei. It'd be Katanas as a weapon. Or I'd slap a bandaid on it in the form of letting a sword blade change subtype to Katana.
The problem is it's forced into using weapons that aren't good. Most katanas have bad scaling compared to the 'good' swords that actually work, or have boring effects that don't ACTUALLY do anything of note.
If I were to overhaul anything, it wouldn't be Kensei. It'd be Katanas as a weapon. Or I'd slap a bandaid on it in the form of letting a sword blade change subtype to Katana.