Thanks Syncro. I was being more tongue-in-cheek about how the terms are thrown around with little useful definition, rather than looking for bike recommendations. I've been riding all these trails since 94 on a range of bikes starting with steep angle fully rigid spindle-ly things. Currently on a Slash, which I quite like - climbs pretty good I find. I have a line on really good deal for a Remedy 9.8 (carbon frame and wheels) at the moment, so considering that. Looks like Trek is discontinuing 27.5" options so hence the opportunity on a close-out.
The biggest choice in front of me seems to be wheel size. Test rode a 29er Santa Cruz quite a few years ago, I didn't love the floppy feel of the big wheels and the bike seemed overly long for my tastes. Pretty happy with 27.5 on the Slash - they already seem big after so many years on 26"
"Downcountry" was a new term I found recently which I had never heard of and annoyed me! So I guess we have:
XC - for flatlanders
Downcountry - burly XC as you say
Trail - for, I guess, riding on trails? Perhaps Upcountry trails with slope to them!
All Mountain - OK for sure this is for use on mountains....
Enduro - a trail bike optimized for speed
Downhill - an enduro bike you'd never want to ride up hill
Park - i dunno, pretty much a downhill bike I guess