[dsr_]

It's true, which is why that's in the standard cautions.

But it's also the case that you can get reasonably priced headphones and speakers (reasonably priced by the standards of nonaudiophiles!) that do not have terrible resonances. So: you can't fix everything, but if you're paying attention before you buy, you can avoid making mistakes.

E.g.: Kali LP8v2 are frequently on sale for $400/pair; that includes amplification. Moondrop Chu II IEMs are under $25.