> You think that after my 500h of work and daily usage of my own app, I have no idea about what maintenance looks like.

At 30 users you have no idea what maintenance looks like. That's literally what maintenance is - responding to real world usage.

Come back with your experience when you have lots of users that stick with your app, you're putting out fires and implementing new features. Your experience will be meaningful after 6 months to a year.

I'll wager that right now you have a PoC that needs a lot of work to be something that retains users. That's not a criticism, that's just how it works for every startup.