I think one of the reasons Google choose UDP is that it's already a popular protocol, on which you can build reliable packets, while also having the base UDP unreliability on the side.
From my perspective, which is a web developer's, having QUIC, allowed the web standards to easily piggy back on top of it for the Webtransport API, which is ways better than the current HTTP stack and WebRTC which is a complete mess.
Basically giving a TCP and UDP implementation for the web.
Knowing this, I feel like it makes more sense to me why Google choose this way of doing, which some people seem to be criticizing.
From my perspective, which is a web developer's, having QUIC, allowed the web standards to easily piggy back on top of it for the Webtransport API, which is ways better than the current HTTP stack and WebRTC which is a complete mess. Basically giving a TCP and UDP implementation for the web.
Knowing this, I feel like it makes more sense to me why Google choose this way of doing, which some people seem to be criticizing.