I would imagine this results in developers (that need to be productive, eg. consultants) not having the time to investigate alternatives, picking one tech stack

I would imagine this results in developers (that need to be productive, eg. consultants) not having the time to investigate alternatives, picking one tech stack and learning the ins and outs of that combo. Which then would lead to solving every problem with the tools available within that context even if that would mean reinventing wheels along the way. Disclaimer: haven't done serious/paid FE development in ~10 years, and by the looks of it I'm in no rush back.