In my experience the clean separation between UI and backend code that a SPA enforces is an enormous maintainability boost. Add to that, that you then have by

In my experience the clean separation between UI and backend code that a SPA enforces is an enormous maintainability boost. Add to that, that you then have by necessity an API you can use for other systems to interact with yours (or just to build some quick one off scripts) and the advantages are even clearer.