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It depends on where your clients are, and where your servers are. You may have a lot of customers in a country and not want to host servers in that country (tax, regulatory, maintenance cost, etc.)

RTT from Hyderabad to the East Coast USA is ~300ms.

Then you have execution and database retrieval.

https://wondernetwork.com/pings

Yeah you can easily get this speed down to like 100ms which is near enough to instant to not matter. You definitely don't need to go to client side rendering for most things to feel fast.

Also I couldn't see any explanation of what happens when a network request fails. That's a huge downside of local rendering.

I think for most sites the best option is still server-side rendering but use a fast backend (e.g. not Python) and lightweight frontend.

Have you tried JIRA or YouTrack?

this is kinda missing the point. yes, the raw http calls __should__ be enough for 300ms.

but the benchmark is similar software like JIRA, which takes agonizingly long to do anything reasonable.