To me, Lee Abrams was the worst thing that happened to FM radio, doing exactly what you described. We'll have to agree to disagree.
You'll have to agree to disagree with me as well, then ... although Abrams is not entirely to blame, I believe creating the structure of AOR radio would have happened anyway. Lee didn't have the original concept, but he had the programming skills to take what he heard at KLOS and other stations that were creating a more consistent sound and spread it.
Remember, that was an era where AM/FM simulcasting was being eliminated in the major markets by FCC decree. The major station groups, collectively, were very wary of progressive rock (I remember, on a trip to Fresno in the 70's, seeing that KARM actually split their
AM to be the prog rocker while leaving the FM as an automated Beautiful Music!) and the idea of having a less "weird" rock format was appealing ... not to mention being more saleable to advertisers.
That last point is the real reason why free-form progressive rock was doomed once FM penetration of listeners started to increase. Radio was as much a business then as it is now, and we're not in the entertainment business as much as we are in the advertising business. As noted in another thread, KMET, fondly remembered by many as the last of the free-forms, had actually adopted a structured AOR approach under Sam Bellamy, and only then achieved ratings parity with KLOS. (And you
know that made then-owner Metromedia a lot happier.) Our memories gloss over that inconvenient fact.