IME, you can definitely optimize certain aspects with various amps that address a particular range better.
But in the long run, after you've gotten used to the sonic effects of that combo, the more cohesive and musically compelling sound from matching amps outweighs the "audio excellence" of disparate amps with disparate dynamics, tone, phase response, etc.
So the job of discovering the best amp that will work at all frequencies is much more difficult.
About the only time I've had luck mixing & matching was with subs working from 40 Hz or lower.
YMMV...
But in the long run, after you've gotten used to the sonic effects of that combo, the more cohesive and musically compelling sound from matching amps outweighs the "audio excellence" of disparate amps with disparate dynamics, tone, phase response, etc.
So the job of discovering the best amp that will work at all frequencies is much more difficult.
About the only time I've had luck mixing & matching was with subs working from 40 Hz or lower.
YMMV...