If you're not living in a first world country (or living in Germany lol), you usually don't have a stable internet connection. I've developed a lot of CRUD apps that are core to many businesses on field and without ServiceWorkers (or the manifest based appcache before) and client side databases that are better suited to use from SPAs, I'd rarely have success in any of those projects.

You don't really need a framework for this. Forms are incredibly easy to handle from React. A framework for declaratively caching relational data with server side components (like poachdb but for SQL server) would have been amazing though.

I don't know Turbolinks enough but it doesn't help with the connection problems I assume?