The impact of middle boxes is overhyped on HN. Games use all kind of random ports and UDP (or TCP), it still works. Them not working on shitty company networks has no impact for real networks.

You either have a box in the way intercepting traffic for policy reasons, in which case quic won’t help as it would be blocked for breaking policy, or you don’t have a box in the way, in which case quic has no benefits (in terms of middle boxes)