Comment by hylaride

Using UDP means QUIC support is as "easy" as adding it to the browser and server software. To add it as a separate protocol would have involved all OS's needing to add support for it into their networking stacks and that would have taken ages and involved more politics. The main reason QUIC was created was so that Google could more effectively push ads and add tracking, remember. The incentives were not there for others to implement it.