I agree with the first part, completely.
If an album sounds harsh because of an excess of certain mids and/or highs, it just doesn't sound good, period. That is not 'vibe', that is just shit sounding and complete ear rape.
However, I completely disagree on RTS.
I think ALL of Pantera's albums from 1990 to RTS (I can't comment on the earlier stuff's production, I don't own those albums and don't care to own them either) sound like poop, just that RTS was the least 'poopy' sounding of the bunch.
Someone should have just told Dimebag to use a goddamn tube amp instead with some mids happening.
I never have, and never will, understand people's fascination with that guitar sound that Dimebag went for on rhythms, nor the sound that Metallica was going for on ...And Justice For All and other similarly super scooped and lifeless guitar sounds.
Quite frankly vastly prefer the super muddy and muffled sounding guitars like on Kyuss records for example. It might not sound 'good' per se (although for the genre it ACTUALLY fits, unlike Dime's sound, because in thrash and groove metal you actually need some mids for some power and punch), but at least it doesn't feel like my ears are being attacked by a swarm of bees