It's less that you have to do the hard parts yourself - the browser brings solutions for almost any SPA issue. The problem is more that you have the option to w

It's less that you have to do the hard parts yourself - the browser brings solutions for almost any SPA issue. The problem is more that you have the option to work around those nice browser implementations, which many big web apps choose to do. Some do so because the APIs weren't available when they were developed, while others do it for analytics purposes.