Comment by ofalkaed

That is not something inherent in guitars themselves, it is the norm in steel string guitars and the fan-braced/Spanish guitar but mostly because that is the norm for all those mass produced guitars which make up the bulk of guitars. On steel string you can often greatly decrease this quality just by switching to flatwounds, this is part of the flatwound sound, it shifts the timbrel content into the players technique but if you want much timbrel content with flatwounds you need heavy strings and a high action, and the hand strength and technique that sort of setup requires.

Before the rise of the steel string and the Spanish guitar, guitars tended to be more even across their range and also had less bass which helped even them out, and now that sound is what we are used to. There have always been niches that wanted that more even sound, but for most that just makes it more difficult to play all that music that developed around these quirks, so they remain niches.