I almost always shut down my laptop. This serves me two purposes:
1) It saves power
2) I always start with a fresh session, keeping distractions at a minimum and having habits to "finish" the current task I am working at. (I do the same with browsers for example. Here I even less frequently save my session).
There are a few exceptions where I know I'll just take a quick break and resume work shortly, but they are rare. No, you don't have to have everything always available within milliseconds. No, I don't need notifications always on (so I guess I agree with the author here). But maybe just different tastes, different habits.
I don't know if this is true, but I talked about a broader topic along those lines with my therapist recently and she was like: 'We invent all these smart things to save time and have more for ourselves, but in reality people have less time, because then they just want to put more tasks into the same timespan'. I have absolutely no idea if there is any truth to that, but it feels true on my empirical observations. Embrace slowness!