Not really, this kind of thinking is exactly what led to the client-side JS framework mess.

Round trips are just fine. Browsers are smart, servers are fast, and HTML compresses well. The site you're reading right now (HN) requires a reload. Stackoverflow requires a reload. Neither are slow to use.

If your page is really that complicated, then I suggest Vue or Preact which are efficient and designed to progressively enhance pages instead of rebuilding everything in JS.