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No.
The AR uses a steel locking collar which the bolt locks into. The locking collar/locking lugs on the bolt are what contains the pressure of cartridge; the aluminum upper has nothing to do with containing the pressure. The take-down pins also have absolutely nothing to do with the with system itself; they basically serve the same function as the pins that hold the trigger on a bolt-action rifle. If you built an AR-15 upper without a gas-port, it would function just like a straight-pull bolt action rifle; Hell, you could even use it without a lower by using a ball peen hammer to strike the firing pin.
The force at which the bolt carrier is propelled backwards is a function of the gas-port dimension/location; and is basically a fixed value. There is no logical reason to have the bolt to cycle faster or sooner; doing so would be very dangerous.
The only reason that an AR-15/10 would shear at the front or rear take-down pins is because someone fell on it at just the right angle, or tried to use it as a pry bar/lever. Maybe there is some stress on the take-down pins holes because of some slop between the lower and the upper, but it is very miniscule.
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