I’m riding an older “now-called-downcountry”-mountainbike, too.
It’s a ’05 Stevens F9 Race, stock with 100/100mm travel and a steep 71° HA, 17mm rims with 2.2″ tires, a 110mm stem and a 680mm bar.
Few years ago I fitted it with a 120mm fork, an angleset, offsetbushings, a 120mm dropperpost, wider 25mm-rims with 2.4 tires, a 90mm stem and a 780mm bar, and voila, there’s my downcountry-bike with a 68° HA.
It works really great on my hometrails and even on rough trails in the alps.
But I don’t think that these DC-bikes makes trailbikes complete obsolet, cause on really trails they are more capable.