Yes, all speakers sound different due to any number of variables, but the "goal" is (for most serious audio manufacturers anyway) to make a violin sound like a violin (Paul Barton?), piano like a piano, recording like the engineer intended ect. In other words neutral. I'm not saying anyone has built a speaker that someone could not tell the difference between a live cellist vs the same through a speaker (THAT would be an interesting double blind test), only that they should be trying to get as close to that presentation as possible without colouration. So should amp designers, if in fact they are able to colour them.

If people like a different sound, they can tinker with their settings, otherwise better to start as close to uncoloured as poss imo.

Half of communication is listening. You can't listen with your mouth.