However, QUIC provides a lot of the features TCP has but very fine-tuned for HTTP. This is fine, HTTP is probably the largest layer 7 protocol on the internet,

However, QUIC provides a lot of the features TCP has but very fine-tuned for HTTP. This is fine, HTTP is probably the largest layer 7 protocol on the internet, but if you were to design a layer 7 protocol that needed a lot of the features that TCP provides it would be quite dump to reimplement them yourself on top of UDP.