Part of the reason is conceptual, alot of old timers like Floyd Toole do not like the "concept" full range room correction above the room transition frequency. However even Harman's own studies have shown that the average listener prefers the sound of multi-measurement, full bandwidth room correction over uncorrected sound, so while there's no studies between "only doing up to 200hz" versus "full range correction", it seems the vast amount of listeners at least think it's better than the uncorrected sound of even speakers that "measure perfectly anechoically". It's also worth noting this bias is mainly in the passive loudspeaker industry, whereas pro audio/active industry has been doing full-bandwidth correction for quite a while, and these are the people who produce the music we listen to.