This. Vast majority of the companies out there are NOT software companies. Meaning, they don’t have full time developers, at least none with decent experience, on a full time payroll. Their internal tools/portals/sites are either maintained by contractors every now and then or junior developers/interns. In these cases, popularity of a technology, documentation, ease of hire, being able to hit the ground running etc are far important than a slightly smaller bundle size and a few extra ms response time. It’s a difference between being able to hire someone easily and not i.e being able to develop features vs months of delays and cost in order to hire a senior “efficient” dev for one of the lesser known platforms.

Choice of tech stack falls somewhere middle or bottom of the list of things to consider when delivering a solution/product. Good enough is good enough. Other factors are far more dominant after a certain point.