There's the key phrase in the entire post.
Ask yourself this: If in 2006, you had posted a list of 13 songs you thought KRTH would be playing in 2023, how well would that list have held up?
Here is where I post my personal and anecdotal experien:
Back decades ago, i commissioned with a well known radio research company my first music test. It was for a station in market 14 which at the time had about a 14 share, double the #2 station.
I decided to score the first 100 songs on the random list of about 700 that we were testing. I gave it a lot of thought, since I was in charge of programming the station and I wanted to know how well my "instincts" were as a nearly 2-decade market veteran.
A third of the songs I gave passing scores to were stiffs and unplayable. about 20 of the songs I thought would never pass actually did pass, and several were in the top 10% of all the songs. Many of my favorites passed, but not at the top.
My conclusion was that insiders whose job depends on songs don't know the street. We know the artists all personally, some of them were friends with whom we exchanged dinner invitations at home. Others were always there for an appearance or as guests on the morning show. I'd been in the studio when some of the songs were recorded. A few were not nice people, and that affected my perspective, too. A couple had tried to bribe me for airplay; I was not fond of them, either.
My point: no individual alone can program a station perfectly, and having listener guidance done with correct research technology makes a big difference.
Did our ratings go up after doing the test? No. Why not? We were already good enough. We just made the station better and far less vulnerable to competition. Was it worth over $20,000 to do? We thought so and continued to do tests regularly after that. Was I depressed at not getting the scores right? No, I realized that getting listener input on other things, like currents and morning show content and formatics would make us better. We were #1 for the entire 22 years I was with the station.