The begs the question site is one of my pet peeves. Language is not moderated by a select few who want to claim it, this isn't France.

This is why Ebonics is still a valid form of English - as long as it is used consistently.

If everyone uses "begs the question" and everyone else understands it as "raises the question" then it is perfectly valid.

Vernacular creates validity, for sure. The site's author acknowledges this, but nonetheless maintains that preserving this particular phrase is useful because there's not really another synonymous and popular phrase that means this particular fallacy, just the Latin petitio principii and the modern translation "laying claim to the principle" which is pretty clumsy if you ask me. Not that "begging the question" is crystal clear either, but at least it's googleable.

Any phrase that succeeds at transferring an idea out of your head into mine is good enough for me.