I don't think it's developers tbh. Or rather, it's another set of perverse incentives in the industry.
To get a job, devs need experience in relevant tech. No company is willing to train their devs - they all have to hit the ground running. So devs have to have demonstrable experience in the tech that lots of companies use. Companies need to hire devs, and don't really care what tech is used. But using what everyone else uses makes their hiring easier because it's easier to find devs who want to work on that tech. So they advertise for devs with experience in a hot tech. The devs see this and try and move their internal projects to use the hot tech so that if/when they look for their next job they'll have experirence in it.
The devs are just trying to stay relevant in a rapidly changing tech scene so they can get their next job.
The companies who employ them don't care what tech is used, but find recruiting devs to be easier if they're working in the latest hot tech.
The key point that could change all this is if companies were willing to train their devs in the tech stack they're using.
To get a job, devs need experience in relevant tech. No company is willing to train their devs - they all have to hit the ground running. So devs have to have demonstrable experience in the tech that lots of companies use. Companies need to hire devs, and don't really care what tech is used. But using what everyone else uses makes their hiring easier because it's easier to find devs who want to work on that tech. So they advertise for devs with experience in a hot tech. The devs see this and try and move their internal projects to use the hot tech so that if/when they look for their next job they'll have experirence in it.
The devs are just trying to stay relevant in a rapidly changing tech scene so they can get their next job.
The companies who employ them don't care what tech is used, but find recruiting devs to be easier if they're working in the latest hot tech.
The key point that could change all this is if companies were willing to train their devs in the tech stack they're using.