I used to have a Palm Pilot around 15 years ago. On that was an app that supported a C dialect. So I wrote a Snake clone in it. Was actually fun. But yeah, there was a pen and a custom input language, I think that's more efficient than fitting a keyboard on to a tiny space.

There's a trend that all kinds of computers become like Stereos. They become very practical to use for recreational tasks and a limited amount of professional tasks. That's not including programming though. I mean a Chromebook is for instance a laptop perfectly suitable for programming but you need to go through some discomfort to configure it for that, although I guess it became easier with time.