[tluyben2]

I can type with my thumbs but it's far slower than using my left thumb and right index finger. I am almost 50.

However, what does that have to do with 2 handed use? Thumbs typing is also 2 hands. Or you mean typing with 1 thumb? I see people, especially Chinese, writing on their phones with 1 thumb and holding it with the same hand (so 1 hand use); you have that too with swipe keyboards though for western languages. This us definitely not faster (or, for me, nicer) than just typing with 1 thumb and 1 finger.

Curious what other people do... I am on a tetras on a busy street now and wasting what (very) young people do: I see them all typing with 2 hands, two thumbs.