"So....why must we STOP correcting grammar?"

Tattie Boggle, stop wasting our time. You're not that naive. ============
Our relationship with apostrophes is far more wonderful and complex than the grammar books suspect.
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Re: Britannia. This is another of those words that have two of something, but many people are not sure which. (You'd think people would realize that if Britain has one T, then Britannia has one T.
But many people don't analyze language. They just let it flow over them.) Other examples:

zucchini or zuchinni?
Conecticutt or Connecticut?
brocolli or broccoli?
paralellepiped or not?

I have a friend whose last name is Henesey or Hennesey or Hennessy. Because of her, I started keeping my address book by my friend's first names.