It's the standard pattern where someone comes along and says "hey, we made this thing which does X pretty well for a good price". Then someone else comes along and say "we wanted to use it for Y, but it's not good at that, therefore the thing itself is bad, and it's creators should have focused on making it good at Y instead".
AFAIK, Raspberry Pi was, among other goals, was designed to help poor students learn software and hardware. I am not sure how one can do this with such a huge proprietary blob.
