I realize the stress in a Glock frame is different than the lower of an AR. My point is that when Glocks first came out, many folks thought it was a bad idea, myself included.
The wear points on an AR polymer lower will be the pin holes. Put metal there and the polymer won't wallow out. One stress point of an AR lower is the "L" shape that's threaded part for the RE. Reinforce that with a metal insert and the polymer lower won't be any more susceptible at that location than an aluminum lower. Another will be the forward receiver pin hole. Release the aft pin and shotgun the upper and it will put stress there on a polymer lower. Reinforce that point as well and a polymer lower will be very durable



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