I think the problem is that even the best tablet is worse than a cheap shitty netbook. Shitty netbooks can be had for $200. The fancy shmancy backwards folding ones, (into a tablet form factor) aren't that much more.
You know what's better than termux? OpenSSH, tmux, a proper term, a proper tiling WM, in X.org. Or Wayland or screen if that's your thing I don't judge.
Termux is just a linux container, it has OpenSSH, and tmux. Yes I agree that a full linux workstation is better then an android phone, but sometimes I like to go out with friends and family and I might still be on call for work, and I really dont want to have to carry around a bulky laptop. Termux is just an extremely nice thing to have on an android phone and there is no legit officially sanctioned method of doing these things on iPad other then iSH which isnt even fully in the app store yet, its only on testflight.
You know what's better than termux? OpenSSH, tmux, a proper term, a proper tiling WM, in X.org. Or Wayland or screen if that's your thing I don't judge.