Indeed, and this can be a problem with "audiophile" gear that is sometimes built with exceptional craftsmanship but not necessarily designed with the best electrical performance in a mainstream sense. For instance if someone believes they must experience a feedback-free Class-A amplifier, well, yes they're going to have some thermal drift and poor power supply noise rejection. that can be hard to replicate. ;-)
Good mainstream designs take component tolerances into account, and it's worth remembering that a 1% variation is a tiny fraction of a dB.
