I think I'd rather tell guys with huge track records of excellence like you, Mr. Gregger whom I've just met online, and Bermuda how to do your jobsOr....you could use threads to understand things you currently don't get.
Rimshots are a sound. They are the typical drum sound of funk and modern popular music.
back in the 70's with disco, The Eagles and Fleetwood Mac, the fat, dead, centre hit was THE SOUND.
If two drummers go for a modern rock gig, one plays centre hits the other rimshots, the latter will probably get the gig. If the same two drummers audition for a 70's AOR cover band, the latter shouldn't get the gig, unless he/she understands centre hits are more appropriate than rimshots.
Ideally you should be good at both strokes and use them from song to song where appropriate.
No, there's enough of that these days on the internet. I once took trumpet lessons when I was a teenager who thought he had a chance in hell of ever being good on the trumpet, and my teacher showed me how I should be working the valves with fingertips and a light touch instead of wrapping my hand around them like a lot of players do. In between the first and second lesson, I saw Maynard Ferguson on TV wrapping his hand around the valves and told the teacher. He deadpans, "And when you get better than Maynard Ferguson, you can tell him that. Right now you need every advantage you can get."