I’m kind of the same way. I play a bunch of old time rural stuff that isn’t hardcore BG. But I like it. I think a bunch of BG gospel really isn’t too bluegrassy, but I like it. Alison Krauss isn’t all BG, all the time, but I like their stuff too. I find it easier to refer to the marginal stuff as bluegrass and move on. I haven’t converted too many rock songs to 'grass, but I love some of the conversions I have heard. I got on a kick for a while where Iron Horse was running all day while I worked.
Sorry to muddy the waters. If I was really trying to clear the water, I’d say for a purist, true bluegrass is only the traditional BG sound, arrangements and instruments similar to what one heard from the originators back in the 50’s and 60’s. Kentucky Thunder would qualify… AKUS, maybe not (for one thing they have WAAAYYYY too many mics). However, I am not a purist by any stretch, so bring on the newgrass/hippiegrass/gospel grass and whatever you call groups like String Cheese Incident (Deadgrass? ).