We as a culture from middle school through gray heads allow our vanity to slay us. We bought into the pretense that we are all brilliant, innate multitaskers. Jive!
Fact is, that is not the normal human state...not mine, nor yours. We are like Pooh, bears of very little brain.
I'll go on about that I learned as a corporate tool, a writer for business magazines and books, and an observer. Bill Gates grew up, as much as he did in fact grow up, as a lackey to his father's WWII and post-Great Depression business imaginings. Employees, from shop floor through management, are untrustworthy. If you slack off on them for a moment, they'll suck the value right from your company. They need to work long hours, very hard, forgo vacations and breaks. They beyond all else can do multiple tasks simultaneously, efficiently. Otherwise, they are stealing from you.
Come back wth me to the days of VisiCalc, that first spreadsheet. You should expect all employees to have many applications open simultaneously. They should flit from one to the next like honeybees.
Bluster and jive!
We see it now beyond MicroSoft Office. We see bozos failing to use their cells and walk, to drive and talk into a "hands-free" phone, and on and on. Cut the crap, ladies and gentlemen.