The silly thing about companies being so obstinate about hiring someone with experience in the exact stack they use is that often times job reqs go unfilled for many weeks or even months. The result is that they end up wasting a lot more time with an unfilled position than if they had just hired that person who needed 2 weeks or so to ramp up.
Letting a developer or engineering job go unfilled for months is nothing, at least in my experience. I've seen a lot of jobs go unfilled for years while the company tried to find a unicorn to fill it, while at the same time priding themselves for being so picky and demanding excessive levels of experience, "full stack" experience, and "culture fit."
