As far as I can tell, the mobile app leaves a bit to be desired. For one thing, I find that half the time, when I click on a link in my mobile email (say a message from Academia recommending an article), I am brought to the mobile app but the article fails to load. The navigation within the app is also a little clunky by modern standards. For example, you can move around between user profiles reasonably well, but not browse or surf by Research Interest really. The reading mode with its ability to convert from PDF into text is a great feature, but also connects uneasily with the rest of the navigation.
I'm not a developer, but have adjacent experience from working wth a lot of project developers in Digital Humanities (so take this with a grain of salt)... The good news I think is that I believe that Academia has done and acocmplished the hard and most valuable things - building a critical mass of users abd getting a basically working PDF-to-text converter. The recommendation engines also work (t omy mind) pretty well). The stuff I'm suggesting above strikes me as mostly more low-hanging fruit in the app devleopment world...