For GUIs in particular the problem is far from solved in the sense you've mentioned. If you write your program in C/C++ we're good, though now you're using a c

For GUIs in particular the problem is far from solved in the sense you've mentioned. If you write your program in C/C++ we're good, though now you're using a clunkly language. If you're using Java you have some decent GUI options, but it's a bit ugly. Still alright. In almost any other languages you're in deep trouble. The prototypical example: building out interfaces in Python. You have some GUI bindings to the cross platform libs, but many have really old and outdated docs. Or licensing issues. Or installation issues. It's super hard to ship a GUI for your Python app compared to anything else with the language Ultimately almost all other languages are used for server software. Packaging and GUIs are super low on the list of priorities. The only exception to this is JavaScript! JavaScript is so much about front-end stuff that legitimate effort is put into getting stuff working well and painlessly. Sure React didn't invent FRP, but the communities gone further with the concepts than any other community. Bar none. So many people refuse to admit it, but the JavaScript community is the state of the art in GUI development. The biggest crutch bring the weak native support of course.