The worst things are the often-non-repeatable or content-sensitive key mappings. Press up once to edit the last message. Press enter. Press up again nothing ha

The worst things are the often-non-repeatable or content-sensitive key mappings. Press up once to edit the last message. Press enter. Press up again nothing happens. Enter means enter except within a code block when it means shift-enter. It feels as awful as using Matlab and missing the += from Octave. Like no one tried to use their own product. It makes me sad.