The only time when you can see a mech with Two Head torso is when you battle at lvl20 range and opponent has it.
Though, most players will soon move forward and buy themselves a new torso.
When i first started, i never bought the Two Head torso though. Don't remember the 2nd or 3rd torso i had but after that i had Alien (lvl9), then Scope (lvl17) and then Solider (lvl17).
About paint:
The fact that you don't like to paint your mech doesn't justify why everyone else aren't allowed to paint theirs.
I like my mechs in sleek, black paint.

Also, most pros use black paint and when seeing black mech as an opponent, i know that i have a nice battle coming.
And as kits go:
I rarely use kits nowdays. If opponent uses some resistance kit then i usually match his move by using one myself but other than that, i don't need kits to win.
Though, for regular players (like me), activating a resistance kit will result loosing money since those things do cost more than the reward is for winning a battle.
Back to the topic then:
I don't see why torsos need extra resistance by default. Want resistance? Use resistance module or kit.
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Aeacus