I don't think I'd call it compromised radio, there was a demand for elevator music (background music) back then. Both Wilmington FM's WSTW (then WDEL-FM) and WJBR, as well as Philly's WEAZ- 101, and WSSH 106.1 if I remember correctly, all played easy listening music. If a station could run a successful business playing Polkas, then that is not compromised radio, but good business radio. Compromised radio implies that it isn't great or cool radio, but that is in the "ear" of the beholder and expressed in the money of the advertisers. If both of those are happy, then it may not be artfully done radio (but it could be), for some it is compelling radio, and other at least I can tolerate it radio, in any case it is successful radio from a business sense. Uncompromised radio would be a station that is a hobby for someone, who has plenty of money and doesn't care about ratings or spots. Then they can play or air whatever type programming, for their ear, makes for compelling radio. Everyone else has to settle for what they hope will be a good business model.
In terms of WJBR and B-101 being good compromise stations, I'd agree, and possibly that is even part of their station's strategy. Be the station that most people can tolerate while at work, since it's supposed to be background music and not distract from the work the office person is doing.