Why would they?

myofibril stimulators work as sort of a nitro for your muscles making you be able to exert an extreme amount of force in a short time using up some stamina, so if you had a car hit you vs a car on nitro hit you the one with nitro would do more damge especially if its something like jet fuel injection (although in which case the car may blow up) myos do have thier fallbacks such as fall damage and the fact that they have to get really close to melee you, so my question to you, why did you let em get that close without killing them?

So you want resistances to explosives AND melee, because you couldn't kill another player with your uber DPS HMG before they finished you off?

Video games aren't about realism!!!!

People use that as an excuse when it is convenient, and disregard it when it isn't.

Games are about escapism, entertainment, and fun.

Unbalanced games aren't fun.

A heavy that already has resistance to explosives, has 5 to 10 times the HP of other suits, and are the sole wielders of the games most powerful weapons is NOT a balanced and fun game.

Heavies are meant to die like the rest of us.

Complaining about an attack that has virtually no range, and requires multiple attacks on a healthy opponent, or taking advantage of a weakened opponent is less about realism than about suiting your own agenda.

Noticed an error in my previous comment and edited accordingly.

I was not intending to suggest that heavies are currently unbalanced, just that adding another meaningless resistance to their already formidable functions would be pushing them towards imbalance.