Paired with a Bluetooth keyboard, it is fine IMO. The screen is a little bit small. Sometimes if I’m going to SSH from my phone, I’ll put the phone on a little stand in front of the keyboard, so it can sit more like a foot from my face, or whatever (normal cellphone usage distance). Or, I’ll put it in portrait mode farther away and think of it as “half a screen.”
Either way works fine for short stints. Nebulous concerns about eyeball heath for long sessions, although I have no real evidence to back that up, and we’re all screwed on that front anyway, right?