[virattara]

I think the time taken by end-users/customers using your app will be of more concern here since they will take significantly more time to upgrade their devices to a new transport protocol or fixes in existing ones. QUIC will enable us to restrict such updates to the developer level.

[the8472]

That doesn't really explain what changed, where the urgency is coming from. Also note that some TCP improvements are sender-side only, so you only need to upgrade your server, not all client devices.

[afiori]

The urgency is coming from mobile networks and high reliance on low latency for user engagement.

Also even if we assume that 50% of all internet users have access the most modern protocols as soon as reasonable we still care about how quickly the next half will upgrade.

And in a sense I agree with this vision of the internet. On one hand the internet could be a super optimized distributed communication network with a lot of embedded functionality (I really like the concept of content-centric-networks/name-centric-networks) on the other hand the internet could be a dumb many-ended pipe (the IP protocol)

In terms of how I use the internet in practice I always prefer the dumb pipe model.