"I mean, would you write code on your phone? Actually, don't answer, because I don't want to know."
Yes I would - I do that pretty often these days (partly because LLMs called from my phone do the frustrating typing part for me.)
I find it convenient to do both some programming and exploring documentation and new technologies on a tablet, and just discard those that don't allow me to. If you're selling to computer professionals you shouldn't try to preempt the expected problem of customers complaining that your services don't render right on a small iPhone.
Phones are definitely usable as desktops nowadays, especially if you stick it in a cardboard and can actually see (make use of) most of the pixels on the screen. People just haven't gotten used to it yet. They're not slow either, and for some workloads apparently very fast: I recently also noticed my phone is faster at certain ffmpeg codecs than my laptop!
Ergonomically it's quite good, your fingers end up in a convenient place and when you want to reallocate your body you remove and reset the circles to new positions. The drawback is that on a phone you need to use both hands to type, but if you're doing something like programming or text editing you'll likely be rather involved anyway.
It's also nice that the keyboard doesn't hide half the screen, instead you can look through the circles or touch outside of them to temporarily hide the keyboard entirely.
Edit: Right, forgot to mention perhaps the best functionality, the sixth circle repeats the last bytes it sent, so if you do some action you have a button to just do it again and again. Comes in handy all the time.
https://play.google.com/store/apps/details?id=de.software_la...
I'm mostly in a terminal, commonly in vim, where the 'regular keyboard' experience makes text and code editing quite convenient compared to the usual software keyboard suspects. In web forms and the like it's also fairly convenient, one can send move left and then hit repeat until the correct position (or any number of arrow key equivalents for moving rows). I hardly ever move the cursor by pointing somewhere in the text.
It took me something like three weeks to become really fluent in Penti, back in 2017-2018 I think.