You'd be surprised, then. Some managers don't know squat. I rolled onto a project once and found that an entire application was being delivered as a 300MB ActiveX control, to run in a browser because that was cool and "cutting-edge" at the time.

Looking at the code, I found it was using UI elements for data storage and other such nonsense. A colleague and I had to tell the manager that the entire thing had to be rewritten. I'm not sure he actually went pale, but that's how I remember it.

It is EXACTLY the type of people that are hired to make decisions, because of either nepotism or impressing with portfolio filled with overcomplicated, 3.js frontpages.

When you give the project to a bunch of junior devs the stack is necessarily decided by one or more of them since there's nobody else to decide it...