The part I find funny is considering how often the "latest great thing" changes so quickly is that it shows a decent developer can shift to another thing in the ecosystem quickly. Making the "if you aren't using Brand X, then you're behind" attitude seem kind of silly. Considering the response can easily be "give me a few hours and I'll be using Brand X". I've shifted through a dozen or so "latest thing" in my career without much trouble at all.