Why can't we use non-primed bodies on prime warframes?

Especially now that Nova skins finally got in the game I find myself tempted to buy them only to find out they're ruined by the stupidly flashy Myanmar neck rings (Visage has that sexy stewardess look until you see the clown head on a fucking spring jumping the shit out of you). I also want some life into Frost Prime without shelling out cash or plat for the immortal skin.

Fashion frame QoL NEVER EVER.