I think there's a lot of us that do more or less serious programming on our handhelds. The author of Picolisp does a lot of development on a tablet, and has created his own software keyboard: https://software-lab.de/penti.html
I've been using it for years, and have solved crises at work with it and Termux by SSH:ing from my phone into a box attached to the right VPN and jumped from there to control over production. Tablets are really nice in this area, they have a lot of battery time and one can lay in bed and do the stuff in vim, tmux, &c. as one usually does, just a little bit slower due to software keyboards being a bit less efficient.
I've been using it for years, and have solved crises at work with it and Termux by SSH:ing from my phone into a box attached to the right VPN and jumped from there to control over production. Tablets are really nice in this area, they have a lot of battery time and one can lay in bed and do the stuff in vim, tmux, &c. as one usually does, just a little bit slower due to software keyboards being a bit less efficient.