Apparently, the next version of macOS (Catalina) will come with a “Project Catalyst” which will facilitate ports of iOS apps to macOS. Apple’s own marketing — interpret this with as much hesitation as you would like — suggests that apps could be ported over to macOS in a matter of days. And I have reason to believe this would be the case, since i(Pad)OS and macOS are fundamentally the same platform, so I imagine most of the changes have to do with using the “correct” UX metaphors.
So... Wikipedia has an iOS app, including an iPad app that is actually meant to be used on iPads. If it would not be much effort, a Wikipedia app on macOS would be mindblowingly cool, especially as fun new features are added to the app.
