Earlier quoted context omitted.
Meh, I've worked 15 years almost entirely at companies using almost entirely in-house technology. Maybe it's because I don't interview for web-tech roles, but I really have never had any problems getting opportunities, and I don't think I'm unique. I think buzzwords are less relevant if you have any amount of specialist skills or significant experience. For instance, I constantly head hunted for jobs with Unreal Engi…
To counter your experience, mine (in London) was almost exactly what Animats described. I worked on the same application for a decade, we introduced new tech when appropriate, but we also stuck with the fundamentals we chose right at the start simply because they weren't broken. That did mean, however, that when I came to looking for a new role I was _way_ behind other candidates.
* Unless you want to do Perl maintenance or C++ for fintech, I suppose.