> They really didn't fall short. A lot of people who would've had assistants no longer do, now it's really just the executives like you said. But fairly low managers used to have them and now they don't.

I think the reason for this is labor cost, and "good enough". I don't think a smartphone is an equivalent replacement for a dedicated assistant. The average mid-level manager who would have had an assistant 30 years ago likely (today) spends more time on "assistant-y" work than they would if they had an assistant today. It's just that now they do 30% of the work the assistant did, and their phone handles the other 60%. That kind of ratio is enough to make upper management believe that human assistants for the lower-level folks isn't worth the cost. (While they themselves of course still have human assistants.)