A great secretary allows you to focus on getting development or whatever work you do in and out instead of on the day to day running of life.
I don't want a scrum master, I want a secretary.
As a manager, 90% of what I do as a manager is follow up with people, act as an escalation point for managing timelines, organizing who can do what, and none of this really is a skill related to my actual skillset.
Luckily I am able to commit to 20/hrs a week of development, but I could probably do 35 with a secretary - and use those last 5 hours to focus on strategy, direction, leadership stuff that's actually important.