Is there a particular reason to go ahead and preemptively blacklist every country's TLD you doubt you'd ever receive an email from? Would it not be better like

Is there a particular reason to go ahead and preemptively blacklist every country's TLD you doubt you'd ever receive an email from? Would it not be better like if spam isn't expected to be an issue you might as well leave it open, then if you do one day receive a spam from that TLD, block it then? Otherwise, let's hypothetically say you have a friend named "jacob peter" who really likes his initials (and doesn't understand the topic of this discussion), so he registers somewhere in Japan that lets him have dot-JP as his TLD. The only hypothetical way he knows to contact you is via your email server (let's also assume he doesn't do stuff like social media, phones, etc., so he can't find any other way and you have no way to contact him). If you have hypothetically preemptively blacklisted all of Asia's TLDs, then you'd never talk to him again for as long as you live, right?