Why not?

I am not saying that it should be done from scratch. But most recent research done in the recent years about the protocols used on the web tend to be built on top of UDP and not TCP, for many historical reasons.

In theory TCP would be the better choice, but in practice this is more complex than you assume.

I think that many people have a knee-jerk reaction when talking about TCP vs UDP, but they probably don't know as much as they think... (parrots)

The onus is on you to explain why. Why not: Smaller payloads per packet and missing out on all the TCP algorithms already implemented in hardware en route.