I kinda laughed at this Delta ad I saw while walking down a jetbridge to a plane the other day.
Not zero emails in the inbox, not zero tasks left to complete, you should buy the plane wifi just so you can click on each email and make sure it goes from Unread to read.
I do think it’s OK to kinda poke through your inbox sometimes just to remind your brain about things in there you might need to get to. But just marking your messages as read is essentially fake work. Be wary of fake work.