Wow! That would really handcuff the jocks on content. Between the calls, the slogan, the artist, song title and whatever liner/psa/promo was logged. Man, that's a lot of required stuff before you even get to a caller or a bit or any personality.
And I also hate the stations that say "we never talk over the music". You have just handcuffed yourself FOREVER. There's no way to go back on that...even with a new PD. Listeners just know you lied about that promise, should you change it.