It's not as if Java and Go programmers don't understand the value of "zero-cost abstractions" (a term from the same 1990s vintage as the first version of Java) and manual memory management. I don't see a lot of serious energy being applied to getting Go running in the Linux kernel. To my eyes, the only people who really seem uncertain about Rust's value are the "those aren't systems programming languages!" people. Rust is not good because we finally have a language to do systems programming in; it's good because it's a good, interesting language on its own merits.
https://video.ch9.ms/ch9/6596/ed57ccc9-2cbb-42b0-b4f0-70909f...
(It's hard for me to disagree with any of them, except maybe that I don't at all agree with Alexandescu's argument that systems programming is defined in part by being able to forge pointers from integers --- something, of course, that you can do in both Go and Rust [unfortunately]).