The point here is to improve the user/developer experience learning Elm. It's one of the things that make Elm such a nice language to work with. A error message that suggests how you might fix the problem is so useful when you are not familiar with the language or programming in general.

Being able to do frontend development that /just works/ when it compiles is fantastic. I have yet to use Elm for anything serious because I mostly do backend work, but if I need to Elm would be my choice. No more 'undefined is not a function' mysteries or trying to figure out what part of the latest Javascript framework is stopping me.

Elm has the basics of what you need to develop frontend applications today, even though I'm sure there is work to be done yet.