Curious how people would react to the assertion, "Klipsch speakers need a more careful pairing than other similar speakers." That would be helpful, possibly, as a data point.
I do think one needs to pay more attention to supporting gear when going with klipsch. That said, the current models of Heritage speakers are more forgiving and linear than older versions. If what you heard was something out of the 70s or 80s (even 90s), then what is available now is a different animal. My LS II are vintage 2019 and you would be hard pressed to hear anything "shouty" about them with any type of recording.
But better source components and amplification will get the most out of klipsch speakers, no doubt. And proper positioning and room treatments. These are, of course, things that make any speaker shine. But may be more important with horns.