You can fix issues in beta all you want. There's a new version of every device, platform, and browser coming out soon. And you'll have to do it again — in production.
All apps are bound to fail and reach their end-of-life one day.
Nearly every app out there is currently failing a user in some way. Yours is not, and/or will not be, the only one.
Sometimes, one user's buggy app is another user's non-buggy app.
This year shiny, next year buggy — it will never end. Enlife your joy.
There exists no such thing as an app totally-free of bugs.
Focus on these testing goals and you will be successful: (1) unexpected outcomes in core functionality caused by code changes, and (2) new UI/UX problems able to affect the entire userbase.
Fortune Cookie Philosophy For Testing, Set 1
Fortune Cookie Philosophy For Testing, Set 3