One of my pet theories about the software industry is that nobody really knows how to manage mature tech companies (YC and the startup world are pretty good at running young companies).

One obvious and disastrous phenomenon in the tech world is resume-driven development: some engineers are highly motivated to put the next shiny tech buzzword on their resume, so they make sure to push that technology at their company. 9 times out of 10 the project and company would be better off by just using the standard, boring tech that everyone else uses. Tech managers should be able to detect this pattern and squash it, but they don't seem able to do so.