The agency was a JS abusing their client so idk why you would just lash out at new great technologies when they weren't part of this.
See also magpie developers. It's not that the new technologies are not great, it's just that in most cases it's not what a client needs, but what the developers want to do. They will have a solution and look for a problem to match.
I mean I'm not innocent of that, I'm looking left and right for problems where I could use Go to solve them with because I enjoy it. But I am aware of the risks.
Anyway the comparison is apt because it happens with developers; I've seen it happen firsthand at multiple projects, and in almost ALL of those, after the consultants left, the company moved back to their own technology, picked something off-the-shelf, or did yet another rebuild.