How does the input impedance of an amplifier effect it sonically?

I understand the effects of an output to input impedance miss-match, but what I don’t understand is
why there’s such wide range in (especially input) impedances. Most tube amplifiers have a very input impedance. Solid state on the other hand has impedances that range from 5-250k. Why so much variance and how does it effect the sound of an amplifier, if it does at all?