Those are exactly the same thing if you convince everyone they are holding it wrong by holding it right.

e.g. Fosbury flop (https://en.wikipedia.org/wiki/Fosbury_flop)

"You can change the world if you make it easier to meet a need enough people have"

True and should not be forgotten in this debate.

But clear communication is a need many people have.

Persuasion by argument, maybe not. But if you simply ask for clarification when you hear "nth century" but not when you hear "n-hundreds" then you've effectively made it easier for the speaker to meet their need one way over the other way.

Same thing for "this weekend" when. Not spoken during a weekend.