Growing pains. It can be a real pita getting their audio system to interface with the protocol that network uses.
It's a pita with any system. Audacy tried to do a lot of internal syndication during covid, and they had a lot of trouble getting clocks to sync up around the country. Right now, all of their country stations are carrying a national mid-day show from Nashville and an evening show from Detroit. I listen to a lot of sports on the radio, and there aren't many college or pro teams that don't do a "network." So that top-of-the-hour break can be hit or miss. If local spots aren't timed exactly right, you'll have rejoin problems.
Costs will drive local stations back to being just relays, like network tv. That might even put a real time voice on overnights, now mostly a wasteland of automation and tracking.
It's not just about saving money. Also about making money. There simply aren't enough people listening at night in any one city. Advertisers want a bigger number before they'll even consider buying time. Even New York or Los Angeles. Audacy is combining news coverage between KCBS San Francisco and KNX LA. Each of these stations is top rated in their local town. But there's not enough money being made to staff each of them locally.
The other part is delivering the best show. Sure they could hire college kids at minimum wage the way they did in the 70s. I heard a lot of Cleveland State students got their start that way. Is that really what you want to hear on the radio? Or would you rather hear someone who has credibility in the format, who can carry an interview with a top artist? The music isn't being made in Cleveland anymore.