Blank canvas would be …
650B tough (probably steel) hard tail, 140mm fork (ideally as simple as the old Fox Vanillas), 1*11, 200mm/180mm rotors and reliable brakes, dropper.
Basically my 456 but a bit lighter, built to a better standard of finish and 650b so I can easily get decent spare wheels and tyres.
Shit on the road, good enough for an all dayer in the hills, not a chore on towpaths/railway lines etc., great for a trail centre blue/red route/quick blat ride, good for riding with the family.