First, the idiosyncrasies of the rich and powerful are way less important than the amount of space given to them in the press, even for this extremely short article. Very few of these "Jack doesn't use a computer" and "Tim Cook wakes up at 4 o'clock" are actually useful, aside from the voyeur aspect. For all we know Jack has some pretty brutal RSI and Siri is the only way that he can actually type, or whatever.
It's pointless, is what I'm saying.
And with more snark: it's not like he's running all those companies well. Twitter is a garbage fire that's probably propped up by bots that Twitter is ignoring for their ad revenue. Everyone I know resents what Twitter does to their mental health and wants to spend less time on it and talking about it, myself certainly included.