In my experience more than 9/10 programmers I've worked with have never used Docker before and of those who have, the majority have never used Docker for anything personal.

If I hand them an image for a Dev Container, sure, they might use it, but it becomes "a thing we need to do, to compile our code in our IDE" not a tool they would use for isolation*.

*) OP seemed to imply that containerization would be nice for safety and security compared to bare metal, but containers were never built for isolation in the first place, mind you. They are namespaces and chicken-coop-like-jails at best.