Possibly true of the devices themselves (although dubious generally), but definitely not true of wireless networks. If you can deliver a rendered page in 10 KB versus a 1 KB doc and 120 KB of framework to render that same page, you win. That’s true regardless of whether it’s a 3G connection or 5G.

SPAs can hold a small advantage in the aggregate, so if you expect your users to be bouncing around routes quite often within a session, you might amortize the cost of the view framework and bundles, but that’s probably not the typical case on mobile, particularly in developing regions.