No some are poorly designed or made poorly and suck. Good SS amps of low distortion and similar power/driving abilities sound so very close it's uncanny. We're not splitting atoms or trying to find the meaning of life here. Headphones are much harder to get right and easily show bigger differences. Of course once you get to the good stuff the gulf narrows.
The biggest variable is us, our imaginations, exaggerations and group think. Some will argue my point, IMO mostly people that have overspent or have an emotional investment or for social reasons.
Heck, I'm not forcing anyone to think or feel any which way.