I'm gathering you are talking PC here to which I would say none personally as I've never found it lacking, I'll use full blown applications or a browser. Now if you a speaking mobile well you know that is a waste of time do you not?
Same as Laura here.
I seldom if ever look for apps under W10.
I don't use the Win desktop much these days.
When I do find time to use my notebook it's for image editing with executes that will most likely never appear as an app.
I would like to see a decent UWP Java IDE in the Microsoft Store. Especially one that worked properly on W10M as well. All the current ones have issues when working on W10M. This issue is a difference between the on-screen caret and the actual cursor position on-screen. It makes editing or typing code on W10M really hard to do.