Wikipedia says GCD and Go are the same age (both released 2009). Is Go also different for the sake of being different? Why is Go good and GCD bad?
I imagine we’re not going to convince each other of the technical merits, but I personally think GCD is a very nice programming model. I’m less of a fan of Go but plenty of people love it so clearly there’s something there. There’s room for both.
It’s a valid criticism of a lot of Apple tech that it’s very locked down, but given libdispatch is open source (as are the Clang changes to support block syntax in C) I don’t think that criticism is fair here.
