Well, it’s not particularly diplomatically put! 
I understand what you mean: I wouldn’t be the first person to admit to changing an EQ or other some such adjustment, to think that I’ve heard the change, only to realise that the effect or whatever is bypassed …
I tend to use very little on GEQ for the room itself, because we mainly use digital instruments, and it’s rare that I need do more than adjust the SUB level, or perhaps the crossover frequencies.
Without a very complex analysis of what’s actually going on with the phase shifting, I guess I’ll just have to trust my MkI ears … With my MkI eyes as a help … 
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