But realistically, you’re never going to stop a motivated app designer who is dead set on making their app an unique snowflake art project rather than a tool that users need to use.
There are also some classes of apps where the platform UI kit is insufficient. Immediate examples that come to mind are kiosk software, trading software, games, etc.
But realistically, you’re never going to stop a motivated app designer who is dead set on making their app an unique snowflake art project rather than a tool that users need to use.