That is arguable, at best it is functional enough so that people can use it, at worst it is not functional for squat and it is mostly dominant because of the incubator attached to it.

In fact I wonder the rate of drop vs new user retention as it is hard to follow a thread, there is no clarity in the headline differentiations... it is really a tough argument to say that it lacks nothing and / or is a good example of function over design...