Keeping all state server side is a completely reasonable approach. The 37Signals guys have been advocating for it since 2006 or so and as long as you have a low

Keeping all state server side is a completely reasonable approach. The 37Signals guys have been advocating for it since 2006 or so and as long as you have a low latency connection to the server then it usually works great. What doesn't work well (and what tended to happen with jQuery apps) is having state both on the client and on the server and having to coordinate between the two. My personal preference is for client side state with a lighter setup than React (i.e. Svelte). I like the predictable latency and I feel you don't run into a complexity barrier (e.g. multi-step forms) as the app grows.