I think I agree with you Chas.
Pieces clearly should be designed and then held in the most appropriate way to achieve the desired result.
....but I happen to think that the base needs to be considered carefully rather than being an afterthought and dictated by the chucking method or perhaps worst motivated by creating something that maximises the use of turning blank. IMHO calling the bottom something specific gives it some focus.
I may regret this but the expression "lipstick on the pig" springs to mind as I think about humungous decorated recesses on bowls created in an attempt to legitimize leaving the chucking point on, and cow-pat like items without a foot that sit flat on the deck. But on the other hand, footless bowls which have almost hemispherical bottoms or footless boxes can clearly look great without.
So sure, a foot isn't always necessary but in many cases it can literally lift a piece if it is nicely proportioned and in keeping.
Jon