Erik, there is a reason loudspeaker designers still work hard to get theirs to sound as natural (lifelike timbres, especially vocals) as the 1957 Quad ESL.
Can you point out specific evidence or is this your personal assumption?
Limitations yes, but not at what’s most important to some music lovers. Add a pair or quad of dipole subs, and you may forget about what they don’t do.
I’m not saying otherwise, just wanted to suggest to arm chair speaker designers that the perception of speed comes from the dispersion alone.
Best,
E