I don't think you've ever designed a scalable webapp that requires synchronized user data to be available across browsers, platforms, sessions, etc. It's a bas

I don't think you've ever designed a scalable webapp that requires synchronized user data to be available across browsers, platforms, sessions, etc. It's a basic fundamental tradeoff decision that all app developers have to make - store client-side or server-side and if you want any kind of sanity for the user, it's usually better to store server-side.