If an icecream shop only has one flavor, I might get lucky and discover it's the flavor I like. But more likely, I'll just be screwed and have to settle for something I don't like. Only an icecream shop with variety can hope to give the most amount of people an optimal experience.
Unless the ice cream shop provides you with hundreds of flavours, 90% of which are nearly indistinguishable from each other. And hardly anyone on this planet can answer a straight question of "Which flavour is good".
The problem under discussion here is not that of using a distro you like, but finding a distro that you like.