What are the actual maintenance items you will run into for offline utilities if the initial version has been throughly tested and works exactly how you want it?
Is it typically bug hunting on edge cases? Feature requests? If the initial product is polished enough, what can I realistically expect to run into down the line?
Software will never be truly stable as long as their environment (the world, ultimately) is not stable
The OS changes all the time, Apple/Google stop supporting an API your app relied on, security vulnerabilities get published, even stupid stuff like timezone changes can break a perfect app in strange ways.