Sorry, but at this point you have no idea what the maintenance looks like.
Can you explain to me how I would develop the project for 7 months and grow the codebase to 500k LOC without maintaining it at all?
The argument seems nonsensical to me, but I've been getting that comment a few times on HN.
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.
I have a pretty good idea about what maintenance looks like. Particularly so about the technical aspects of how effective the models are at refactoring or fixing bugs.
Even if I were to accept the argument that users would have entirely different expectations for my app than I do, it hardly changes the fact that I already know I can easily implement large changes in the code base.
"Maintenance" does not mean "development after the first week".