Higher sensitivity - more dynamic sound?

Ok, obviously I’m dog paddling in the deep end … but if the amplifier has a very large - let’s say infinite - current capability, so can maintain voltage to be applied as the speakers impedance changes with signal frequency changes …?

[I have a lot of reading to do]

Frankly, any reasonably well designed and mated combination of speaker and amp can be sufficient.

Consider that most rock /pop recordings have a whopping dynamic range of maybe 10db. Classical will have the widest range, perhaps 30 db.