By now, it’s all been done, and the audio quality has been good enough for enough time that it gets harder to know if a song was made today, or 5, 10, 20 years ago.
Pop/Rock has pretty much reached the lifecycle phase that Classical Music has. People just listen to the classics and aren’t really interested in hearing any of the new stuff that comes out.
The “Top 40” stuff is disposable and largely forgotten in a few months.
You are right for the most part, especially when it comes to contemporary pop/“top 40” stuff. You could use AI to make it. Anyone with a good auto tune right and drum machine can turn that stuff out. Thankfully there are exceptions like Joe Bonamassa or Steve Earl who can get to done but not many others.