Cap'n Kobold
Hero
Spellcasting however, does scale and offer interesting options.That's definitely not the problem.
Weapon attacks generally scale elegantly and in interesting ways (Extra attacks, maneuvers, divine strike, sneak attack, etc.). Cantrips, with the possible exception of the single-classed warlock, do not.
Presumably the OP who put forward this homebrew suggestion will however. Particularly after that response to Blue's comments.I doubt Crawford is scanning this thread for UA content, so we probably aren't going to see any extensive implementation examples.