Turning off the computer would work just as well. The problem is that both solutions are an enormous productivity impediments. I routinely work with multiple computers across a local network where opened File Explorer windows is not a luxury, but a necessity.
That is exactly it. It is coming down to lots of people needing to do this extra hoop-jumping, plus lots of people need to have various explorer windows open when they work (even in the background) - and un-minimising explorer windows requires time and effort. Maybe ok for a once-off. But definitely not for every day or for every work day for weeks, months, year.