Availability of documentation and tooling, widespread adaptation and access to already-trained-at-someone-else's-dime possibility is deemed safe for hiring decision. Sometimes, the narrow tech is spotted in the wild, but it was mostly some senior/staff engineer wanted to experiment something which became part of production because management saw no issue, will sometimes open some doors for practitioners of those stack but the probability is akin to getting hit by lightning strike.
To me constantly chasing the latest trends means lack of experience in a team and absence of focus on what is actually important, which is delivering the product.
On one hand, yes, when it comes to picking tools for new projects, LLM awareness of them is now a consideration in large companies.
And at the same time, those same companies are willing to spend time and effort to ensure that their own tooling is well-represented in the training sets for SOTA models. To the point where they work directly with the corresponding teams at OpenAI etc.
And yes, it does mean that the barrier to entry for new competitors is that much higher, especially when they don't have the resources to do the same.
Until the tech catches up it will have a stifling effect on progress toward and adoption of new things (which imo is pretty common of new/immature tech, eg how culture has more generally kind of stagnated since the early 2000s)