[cdchn]

>Users don't care about tech choice.

You're right, they don't. The user experience is that they're front-loading their wait time loading the app, and aren't doing a whole request/response cycle for every action they want to take. The end result is the net wait for their active session being lower.

>so does that not indicate that they do so despite the performance

It indicates they're trying to maximize features, rather than minimize load time.

>I'm on a 2GBit/s fiber connection with 3ms ping to youtube.com

Cool maybe your computer is slow then. Sample size of 1, anecdata, etc.