A lot of that complexity belongs on the back end. Every front end page is likely to have a separate number of REST endpoints, so the code is effectively duplic

A lot of that complexity belongs on the back end. Every front end page is likely to have a separate number of REST endpoints, so the code is effectively duplicated. In my experience keeping as much of the code on the back end eliminates a lot of complexity, though I am far more competent with backend technologies, but I have yet to see a SPA app that reduced complexity.