I see terrain making more as the board, the hills, streams etc but happy to accept crafting as the buildings and features esp from foam. I think it’s a Canadian term more than US or European one but craft shops had (and will if they have survived) plastic models, trains, art materials as well as the traditional crafts.
Webster defines it as ‘an occupation or trade requiring manual dexterity or artistic skill’ AFTER ‘skill in planning, making, or executing’.
Like to O/P I’ve been watching too many videos and now slipped into the dread diorama territory and thinking a slap of paint and a bit of flock just does not cut the mustard anymore. Never going to roll a dice this year if I do not stop drooling at some of the videos.