Today I'm testing on for real during @crazy4pi314 workshop at and to be honest I'm getting a bit grumpy.

- Selecting the kernel didn't allow me to introduce a custom path, I had to open a Python file, add an interpreter there, and then use that as a kernel
- The autocomplete makes no sense if ipykernel is not installed, why not show that before trying to use it? (see GIF)
- Some shortcuts, like `dd` to delete cells, don't work

Not a great DX.