One situation where I would have wanted a real debugger and couldn't use one was in crash reporting on remote systems (like, machine learning code running in some container somewhere, or on a headless box far from the network).
Since Python's built-in tracebacks are pretty minimal, the default crash logs don't offer much help other than a line number. I ended up writing a tool that prints tracebacks along with code context and local variables [i], sort of a souped up version of the built-in crash message. It's surprising how much that already helped in a few situations, makes me wonder why it isn't the default.
So, yes, more debuggers, but also abundant logging everywhere!