Really, do you have any examples? I’d be interested.
Bad can of course be relative, for example the B&W speakers which are popular on this forum don’t measure that well (flat) with regards to frequency response, but many people do like that signature. The drivers individually have excellent measurements which probably also helps.
But speaking of tube amps, I looked up your EAR to see if you meant that, but that seems to measure just fine. Perhaps not as good as some solid state designs, but still. (I also use a tube pre BTW)