First. I love F#. But it didn't take off in the market, so I'm learning Rust.
What I tend to see is that Rust does have a higher learning curve, because you have to change your brain's way of approaching problems. The 'functional' way of viewing things. (plenty of past flame wars on functional programming, so not trying to start that here)
Once you do learn Rust (or functional), it is safer, better, faster. But if you just came in from C++, Java, C#, and try and force that way of thinking into it, then it is difficult and crappy and you wonder what the fuss is about.
For Python.
I tend to think if it wasn't for Machine Learning Libraries, it would have started to die off. It is super great as an ad-hoc, throw together some janky little script to tie some libraries together. It is very useful for new or non-programmers to just whip out something 'close enough'. Or as another poster said, the REPL that is similar to MATLAB. BUT -> Nobody builds big applications in MATLAB. So the use case is either, small janky scripts to do something small and useful, or as MATLAB with REPL which are also small scripts. Once a program gets to a certain size, it would be much better to graduate to something with at least type checking.
I do really hope that the giant ecosystem of Python does start to migrate to RUST. Ecosystems don't turn on a dime, so it will be years. And who knows, Python is also improving, maybe it's shortcomings will be fixed faster than the ecosystem migrates to RUST.