im all for alum AR's & i have a bunch of them.. i keep bunches of everything..
you gotta remember bud.... i operate under the stance of ANY gun is better than no gun. everything has its purpose. stockpiles of ready to use weapons are good for exactly that... grab a gun and shoot until your dead.
that old "hand to hand" bullshit is exactly that. why take a tiny bullet thrower to a up close fight? if your planning on hand to hand? you dont want an AR anyway.
as to your list of things not to do? how many of those have YOU done & broke one?
i have dropped them, knocked them over, fell on them & even used them as a cane.. everything that i do with a alum m4...... still never broke one. however....... i am weapons conscious & believe in protecting the weapon first, me second.. so its always been a roll/landing.. its part of the drills you do for crash landing with a weapon....
what i wouldnt do is expect 1 to work as a club for more than 1 shot or as a sledge hammer. guess what? aluminums dont make good clubs either. the weak point in any AR is at the buffer tube connection.
but then again ive also got STEEL AR's... :-)