I agree. In my opinion though, Haiku's insistence on becoming just another platform to run your UNIX software stack on means it will probably never succeed at that goal.
Anyway, I think you miss the point of Haiku if you think it'll never get anywhere because of how much UNIX software runs on it. It's not here just to "be different from everyone else." The POSIX API makes a lot of sense; anyone going against it has to have a particularly good reason to do so. Even Apple doesn't, for the most part.
So Mac OS X inherited one userbase that appreciated platform-specific software. Haiku doesn't really have anything to inherit like that so until people start making Haiku-specific software, that could be an issue for seeing great Haiku software rather than just ports.
For a while, the OS X app space was rather "pure". A minimalistic aesthethic, plenty of small opnionated productivity applications. Apple itself didn't wreck or disrupt it too much (looking at you, MS Office).
Then mobile happened.