Exactly. Spending as much time, money, and effort on the suits as those here whom have the awesome, "oh dude I wish he'd do some signature MC stuff," suits you don't want to damage or break your babies.
Beyond just a materials situation, where would it be made of robust enough substances to stand actual "MC-style" antics it would be too heavy for most people to wear and move around in easily. Ceramics, Titanium Alloys, and ballistic-resistant and cut-resistant polymers are lighter than steel but they add up.
Also, like Neil Bolkamp and the WETA crew has discovered, the Mjolnir series of Armor (at least in Halo 2&3) isn't..... Quite well designed for anatomically correct people nor a robust and active set of movements.
Not saying that MC's a Ken Doll, but.... He doesn't seem to have the same physical limitations of mobility that "mere mortal men" have.