I admit it's a bit of a straw man. I'm imagining that 1) there exist fascistic purists of the English language (some of the Anglish bunch are definitely like this), 2) they not only like the old letters but they're using them as a dog whistle, and 3) they might be be annoyed by people getting their "pure" spellings wrong.

Nonetheless, I prefer to avoid potential dog whistles if I can help it.

(Semi-relatedly, I also think the runic alphabet is cool, but wouldn't you know it, at least one of those symbols is used by white supremacists. We can't have anything nice.)