It’s been said that your inbox is really just the priorities of other people. They send you something in the hopes that you will reply, purchase, help, etc.
It then stands to reason that if you’re using your inbox as your to-do list, you’re spending most of your time on what other people want you to do, not necessarily what you want to do or need to do to move yourself forward.
I’m not advocating for letting your inbox become unruly. This can only lead to disfunction and stress.
What I am saying is use another method to make sure you’re accomplishing what’s important to you.