Here's a twitter thread worth reading, from the former VP of the Firefox group: https://twitter.com/johnath/status/1116871238922776576

It's easy to make proposals that incrementally increase user security while simultaneously increasing one's own ability to consolidate and exploit user data. Technical appeal needs to be evaluated with a simultaneous critical eye to social impact (QUIC is a perfect example -- it outcompetes TCP on an equivalent link, and falls apart over variable-latency or highly unreliable connections, like those that exist in developing nations -- but of course, Google doesn't care about those audiences).