Any racks that use coasters/ wheels ?

It is about sound quality. If you want the highest sound quality out of your system then vibration control is of paramount importance. Coasters or other convience devices compromise sound quality. So folks interested in sound quality would not consider them.  

Once upon a time I used pointy metal feet galore, but for the past few years the only place I've had pointy metal feet is under my turntable. Whether or not I'm taking a sound quality hit with the current regime I just don't know. I just don't care very much, either, as my stereo has never sounded so good since I had a special room built for it.

I believe you can get butcher block racks with threaded inserts and then find rollers or easy glide feet.

"Never understood why people don’t like coasters for the racks."
Simple. Rollers do not stop vibration.

"Not sure the isolation value is all that meaningful," I am 100% sure that isolation is meaningful even if not using a tt.

Another option is Herbie's Audio Lab Threaded Stud Gliders, i believe they work for racks as well.