What would the difference between exotic & advanced be? or martial & advanced?I agree.
I would go with 4-5 weapon proficiencies.
Basic
Simple
Martial
Exotic
Advanced
I'd add to that an "Arcane" category or subcategory though. Every caster needs a focus item to cast spells, but a mere "focus item" should be on par with "fist" & "improvised weapons". Rather than the multiclass gish friendly cantrips give full casters focus items that allow certain cantrips to be cast & a caster version of extra attack for relevant casters. Instead of the awkward vsm thing & always eventually abused class based loopholes allow the focus item to define more about what types of spells from your spell list they can cast & under what conditions since you can only cast a spell with one focus. That would also put casters firmly back onto the loot treadmill/treasure hauls rather than watching quietly while the rest of the party discusses their new shiny toys.