The existence of these Coordinators is the very definition why IOTA is centralized.
Of course it's easy to create a network when you have centralized supernodes deciding for the network and controlled by a few people. What a garbage.
So mining hasn't become centralized? M'kay.
As for the coordinator, I have yet to find anyone to offer up a technical reason why it can't work once it reaches a critical mass. Do you have one? Or just bland cryptobasics generalizations? It seems that while blockchains get more centralized over time, Iota will become less so.
But when did you start caring so much about decentralization? I seem to remember you thought it was secondary in regard to Monero's asic resistance--what changed?