Ionic is a wonderful APP framework. It is a joy to use it in our business applications. You can see the app running in browser in seconds and live update brings the best user experience. Cannot wait to use this new version with Angular 7 -- a fantastic combination.
I've only deployed an app once with Ionic, and I only ever had one issue with it.
For some reason, notifications on iOS devices would just stop working after a few weeks. The only way to fix it was the re-upload the certificate for notifications. Super annoying, and we never immediately realized it whenever it started happening. I don't use Ionic anymore, so I don't know if that's still an issue.