Nope. It's needless confusion. We're programmers who have stuff to do, and syntactic stuff like unless are not helpful.
if (true) and if not(true) is simple and elegant, and doesn't require any person on my team to stop their flow to puzzle out what the code is supposed to be doing at that point.
But inventing totally new languages even for billion dollar projects is totally fine?
You want a well-justified, inclusive, and consistent yet adaptable style when collaborating with people. It would be selfish to gatekeep a policy without regard for those principles.
if (true) and if not(true) is simple and elegant, and doesn't require any person on my team to stop their flow to puzzle out what the code is supposed to be doing at that point.