To be honest, Google takes care of all the complexity to have apps updated on Android. It's even better, because you can do a stage rollout really easily (i.e. just deploy to 10% of users, then 20%, then 50%, etc.). It's possible to do on a web app but you'll have to do it manually.

You still have to push the apk and stay alert for the feedback, but you have to be careful with web apps update too anyway.

I'm not sure about Apple because it appears the auto-update process is not that smooth and people don't upgrade their app as often as Android users.