This is something I've been meaning to ask for a while; am I the only one who thinks that Everypony/Somepony/Anypony/Nopony is just an alternative, and that Everyone/Someone/Anyone/No one, and Everybody/Somebody/Anybody/Nobody does exist in the ponies' vocabulary?

I get that the "-pony" sufix is the most commonly used, but I fail to see what stops them using the other two occasionally; a pony calling another pony "someone" doesn't in any way stop them being ponies. So, I don't find it a mistake like everyone else seems to, and it's certainly not like when a pony says something like "It's out of my hands now" - that is a mistake, as ponies do not have hands, so they have humanized themselves. Where as saying "Everybody" does not in anyway scream out human like behavior.