Fortunately that era is coming to an end. With QUIC (layered on top of UDP) being the basis for HTTP/3, very few networks will outright block QUIC traffic as many have done with UDP.
And my experience with QUIC so far has been delightful — it's everything I've wanted for decades when TCP was too restrictive and UDP too anaemic.
And my experience with QUIC so far has been delightful — it's everything I've wanted for decades when TCP was too restrictive and UDP too anaemic.