Earlier quoted context omitted.
Personally I think this takedown notice is questionable to say the least (it looks to be a case of inspiration rather than blatant copying), but here is my devil's advocate opinion on design: When you say that designers seek "pointless exclusivity", it's a lot like saying that hackers spend their time doing "pointless tweaking". Exclusivity is the currency of design. When you design something, and ten million people…
It's funny that you actually say that "Exclusivity is the currency of design" , while living in a well designed non-inclusive world (Well designed Signs, Roads, Cars, Mobile devices, etc). Good Design will and always strives to be universal. It's funny that the recent Flat-design trend was triggered by Microsoft's Metro UI, which is inspired by Modern Cities' signage (universal design). Also, isn't the point of icons…
Good Design doesn't sell. Great Design does. Great design will achieve exclusivity by iteratively attempting (and failing) to become universal.
> It's funny that the recent Flat-design trend was triggered by Microsoft's Metro UI, which is inspired by Modern Cities' signage
Which was probably inspired by Mondrian's experiments in exclusivity.