My comment, literally everything after the only bit you seem to have read, contextualises and explains why it's important. Sure, it's not the raw fact that it'

My comment, literally everything after the only bit you seem to have read, contextualises and explains why it's important. Sure, it's not the raw fact that it's 4 octets. It's the fact that it's not any other number, especially the fact that it's a finite resource.