1. On the other hand, that is a particular recording situation which is effectively mono (just the reverb/acoustics are stereo). However, this isn't the case with a lot of other baroque music, antiphonal renaissance/baroque being a particularly obvious example. Making such an antiphonal piece "omnistereophonic" as you call it, would be a serious error of judgement/musicality! Also, the vast majority of original club mixes are mono (or very close to mono) and with vinyl, which is the case in your example, the bass freqs have to be mono.
2. If we're talking pure perception/opinion, then my opinion is that about 2% of all stereophonic recordings benefit from crossfeed and the other 98% should be left alone as crossfeed can only make them worse!
3. Obviously that's not true! For example, there are more than a few bass-heads out there, for whom just about all recordings need correction (additional bass). Are just about all recordings therefore "bad" or is it just a case of their particular perception/preference? Probably no recordings exist that someone, somewhere doesn't think needs correction and therefore, according to your logic, all recordings must be "bad".
4. OK, if we're again going with personal perception/preference rather than the facts/science: My spatial hearing works so that most recordings do not benefit from crossfeed and there is no mystery in it, since crossfeed does not emulate my experience of listening to speakers and doesn't even claim to.
This is largely why we have a Sound Science subforum in the first place, so that we're not just arguing between different individuals' impressions/preferences/perceptions.
G