Do they? A lot of KRTH listeners are Jack listeners too. I don't see listeners picketting outside the Jack studios for more DJ jobs. Quite the opposite, I hear Jack being blasted by the guy in the yellow corvette that just drove by.
I bet if you took all the DJs off of KRTH tomorrow, less than half of the listeners would even notice.
And *that* gets us into the discussion about why stations employ talent to be on their air in the first place.
A frequent complaint is that jocks talk too much and detract from the music. But another frequent complaint is that, with the exception of the morning drive jock, everybody's turned into "liner card readers", no personality, not saying anything interesting, only even cracking the mic a few times an hour as a transition into and out of commercial blocks.
If your model of Classic Hits radio is High Energy Personality Radio, hypothetically (because they're all dead) Robert W. Morgan in the mornings, The Real Don Steele in the afternoons, and Charlie Tuna, Roger Christian and Humble Harve in the other dayparts, then you'll never be satisfied with the current style or talent roster. But if they were to attempt that "KHJ Boss Jock" style again, they'd see their ratings crater, because most listeners in their target demos would hate all the interruptions. They come for the music, not the blather.
Listeners who would enjoy a high-energy presentation, with a lot of talking between songs, have aged out of KRTH's target demo. Even they would burn out after extended TSL, because it's a dated style, and it screams "Sixties/Seventies". The target demo wasn't yet born, or were little kids, when that style faded away.
The other extreme is "Jack". No live jocks at all, just the music, the commercials, and a few pre-recorded liners. (Do they even still do the snark?) Sure, you get the music, but the price is the 16 minute (or whatever it is) commercial load. If there's no value-add, then why not just go to Spotify? I get the ad-supported version, and Spotify feeds me
maybe two minutes of ads every half hour. And I can skip a song I don't like, or switch musical styles on demand if I start getting bored. Can Jack do any of that? And even if it could, 16-4=12 more minute of music per hour.
So Audacy is giving listeners their choice: subdued personality, or no personality. Seems to be working for them today, even if it's leading to the death of music radio tomorrow.