Realistically there is not much reason for flappy bird to be on the store. It could have been a website.
There's plenty of reasons for apps like Flappy Bird to be on the store.
What if I need to program in Java, not JavaScript (because it is a requirement of the project)? What if I need it to not be PWA (because some of the libraries are native-only)? What if I need to add in-app purchases (because it is our business model)?
Does changing "want to" "need to" make a difference? It shouldn't.