As a user, I'm thankful I don't need to sift through hundreds of spam emails a day to find potential false positives. Because that's what you're advocating. You'd apparently like everyone to have a terrible email experience for the sake of your own personal comfort and preference (self hosting your emails).
Besides, for something truly important, the people or organisations who need to reach me know how to do so other than via email (phone, chat, postal mail...).