I once worked for a company that did the same - but with Lotus Notes, in 2013. Modified it into a full-fledged ticketing- and time-tracking tool. Using it took a half hour out of each workday.
I'm using Kodi since several years for the family TV. I only had to tinker with the streaming buffer for YouTube, other than that it required no maintenance.
My wife can use it from her mobile. We can play movies for our kids or stream a YouTube-clip. I'm using a Firefox-addon to cast clips from my browser to Kodi. That's about it, no killer app, just convenient digital media on an old, dumb TV.
Only I'd wish Yatse was ported to iOS (Unless my wife's iPhone dies soon).
Typing on my wife's iPhone SE is an ordeal for me, and I don't even have large hands. For me that's a reason why I prefer largish phones (I have a Pixel 3a, which is not that big).