Welll for one, giving your partner a foot massage usually ends up in them feeling better. Nobody does that with belly buttons.

You're conflating intensity with origin. Sure, the fetish feels like a deep, primal need now; but that doesn’t mean it started that way. Addiction feels like a need, too, but no one thinks the first cigarette was “primal.”

Novelty doesn’t mean “casual curiosity.” It refers to the way our brains fixate on patterns of scarcity, secrecy, or taboo. Especially during formative sexual experiences. Feet are usually hidden and rarely touched; in most cultures, they’re also considered dirty or improper to eroticize. That makes them novel stimuli, and novelty is rocket fuel for sexual imprinting.

The reason there aren’t more bellybutton fetishes? Simple: they’re not as hidden or taboo. You’ll see a bellybutton in every second Instagram post, and no one’s getting banned for it. Feet? Covered, ignored, often stigmatized, and that makes them psychologically ripe for fetishization.

Also, you mention the diversity of foot-related fetishes like it disproves the point, but it confirms it. The foot becomes a canvas for a range of niche fixations, because it’s already been elevated to erotic status by the novelty of its cultural invisibility. From there, everything else: socks, polish, squishing and domination branches off.

TL;DR: Just because your fetish feels deep doesn’t mean it wasn’t shaped by shallow cultural patterns. Read a bit deeper.