Personally I don't see it as a good or bad thing, it's just one way of building web apps, and it so happens it's the one I know how to do.
It’s easy to make this work without JS. It’s telling that this is the state of ‘HTML’. These skills are rusting away and it’s a sad thing.
The truth is that building web apps is a large and complex enough field that it's quite hard for a single person to master all of it, and I think we should normalize the fact that any single developer will have their areas of strength and weakness.
Just do it on a single page, in one big form that's submitted at the end. Don't even bother with styling it.
If a version like that were available, I probably would've completed the survey because I could have more easily judged how long it would take to finish it.
If you want to browse openstreetmap (have an instance on my home server with my email): https://www.rocketgit.com/user/sylware/lnanohtmltiledmap (could be used as a base).