I believe congestion control would be at the application-layer with QUIC, that is, is it left upto L7 protocols like HTTP/3 to implement their own congestion co

I believe congestion control would be at the application-layer with QUIC, that is, is it left upto L7 protocols like HTTP/3 to implement their own congestion control and packet loss? For HTTP/3, then, would fq-codel + BBR work nicely for foreground traffic like voice or video over WebRTC and, say, LEDBAT for background traffic like HTTP downloads or, say, bit-torrent over WebRTC? (I realise congestion control is long from being solvable: https://news.ycombinator.com/item?id=17455276 https://news.ycombinator.com/item?id=17455276)