Hopefully this will bring back website that is focus being on being lightweight, and just display information (or gemini type of alternative), and discourage the SPA development fiasco that has happened.
Not 'back'. This is normal for satellite data other than static Starlink installs with their huge antenna. The iridium Go! Hotspot does about 2400 bps :) they also have a new note expensive version that does up to 88 kbps download and 22 up. Still dialup speed so?
If you download all the UI elements, layout, and styling up-front, and then only have to communicate with the server to fetch structured data that tells the app how to change the user interface, that's strictly better.
The issue, of course, is that most pages (regardless of whether they're SPAs or not) require a large amount of bandwidth to download assets.
But I would expect that a low-bandwidth SPA would be more responsive than a traditional low-bandwidth website where it has to reload the full page every time you do something.
Or - as a user - the LocalCDN addon