Yes, someone who has no idea how to use their shell and tries to get around by making arbitrary guesses will suffer. This is true for bash as well. It's no reason to kill yourself immediately.
There are certainly attempts to create a shell that's powered by Python and allows the Python language into it, but one could not "largely replace bash with the Python REPL". Only people who didn't want a shell in the first place would think that reasonable.
I put it to you that a "shell" that does not natively run the executable programs you type is a non-starter as a shell.
I would be ready for the window if I had to type
rather than There are certainly attempts to create a shell that's powered by Python and allows the Python language into it, but one could not "largely replace bash with the Python REPL". Only people who didn't want a shell in the first place would think that reasonable.