Wow, what a gigantic middle finger to people that try to communicate with you. No, deleting your emails programatically because you haven't got around to reading them is not a good idea. What about all the no-reply alert emails you'll miss?
As for this: "Government departments and legal entities who communicate only through email can override this" - who decides this? The mail provider? Are you trusting the sender to use that flag responsibly?
As for this: "Government departments and legal entities who communicate only through email can override this" - who decides this? The mail provider? Are you trusting the sender to use that flag responsibly?