I took phones as an examples, to easier imagine what I need, however I don’t need it for a phone. Additionally, touchscreens are always slower to operate (definitely for me) than hardware keyboards. If that wasn’t enough, the touchscreen I will be using has about 2FPS, so typing through that would be even slower. The screen is also only 3.5" in diameter, so using an on-screen keyboard would cover the whole screen.
That’s why I actually need a hardware keyboard.