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People screen calls, don't check VM, and block weird numbers. Fewer people have routines where you can waylay them, like taking the 9:04 train predictably, due to flexwork Email has dissolved into multiple DM channels and you can't be sure of successful interrupt on any of them
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And more important people generally have even more unpredictable routines (lots of travel), not to mention more people running interference on interrupt attempts as has always been the case
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And fewer and fewer people are important enough to pull off a sort of "holding court" time (of which office hours is a middle-brow example) where they can manage an attention-demand queue on their own terms
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