The main challenge, I think is that all of those apps are cross-platform, but also want to keep the same look and feel on all platforms - they're using their own UX patterns inside the container which generally don't match up with their host OSes.

There are some applications that do try so - 1password, GitHub for Mac/Windows to name a few that come to mind - but they seem to get less love than the cross-platform webapps. It feels like they get a certain amount of dev time before going to minimal maintenance mode.