Latency to remote servers isn’t half a millisecond. A click off from google would normally take a second or two to render and be much worse at the p95 page load time.
With AMP, this is cut down to tens of milliseconds.
> A click off from google would normally take a second or two to render
The question isn't what do people normally do. The question is what's possible without Google's help. 200ms click-to-render is not difficult.
Google can get that down to 20ms or whatever with AMP, but for 99.999% of sites, Google's monopoly position is not the thing holding you back from faster loads.
Not in my experience; AMP has no latency benefit. Additionally, this doesn't really answer the question other than "Google needs this". What other websites need to do AMP on their end?
With AMP, this is cut down to tens of milliseconds.