Agreed. 95% of all those apps are useless and rehashes of existing apps in some way. And the only reason the whole thing doesn't fall over is because of semi-random search that "spreads" some portion of user downloads to lower quality (or less popular) apps, thereby incentivizing the spaghetti-throwing-at-the-wall ecosystem that is the app stores.

Curation models are better in that sense, because they have a limit that forces a quality filter. The alternative is just an evolution of the spam model. You see it with Google turning the web into blog spam, YouTube with videos, ebay/Amazon/aliexpress with "products", and the app stores with their 5million "apps".