Also reasoning about the borrow checker while doing hard math is a non starter for most people in the field.

in "your world", which aint the same for other ppl.

For web apps perhaps. They're not in that domain. In other domains IO is not the problem, CPU is.

>Also rust shared libraries are already there for pretty much every language that you actually need speed

Given that the whole selling point of this is to not have to use two languages, that's kind of irrelevant to this.

Not even for web apps. You should see how much CPU time a python web app spends doing simple things like filling an html template.