It can definitely seem this way if you only consider the front end. But a challenge that many SPA apps run into is that for the vast majority of SPA apps you en

It can definitely seem this way if you only consider the front end. But a challenge that many SPA apps run into is that for the vast majority of SPA apps you end up in a situation where the front end and back end need to share business logic, and this can be a very complex thing to model and maintain, with either duplicated effort (and the potential of drift) or complicated solutions to keep them in sync, particularly if your front end and back end technologies aren't identical. Most MPA apps treat the browser and front end as dumb clients basically - strictly responsible for putting stuff on a screen