Eh, not necessarily. Both the simplest and most optimized pages I can think of are straight HTML with no Javascript. It takes work to add complexity starting from there!
Remember that devices are less powerful, and that outside the cities the connections still aren't universally that quick.
That said, many JAMstack providers are so wired into CDNs nowadays that actually serving the content closer to these users is just a baseline functionality of the webhost.
I’ve been on this site since 2009. Unfortunately the level of discourse has been in pretty steady decline over the last few years. Knee jerk responses and mindless downvoting are the norm here now.
For a site that’s ostensibly catering to engineers it’s a sad state of affairs. I can’t say I get much value out of it anymore.