Iran might have hypersonics? Trying to remember the news I’ve seen in the past few years, and of course the secrecy makes the magin of error huge.

If they do, I can see a few reasons for not using them already:

1. Maybe they don’t have a bunch, and think they can fight off the U.S. without using them. And if they use them all and the U.S. keeps at it, that’s not good.
2. Maybe they are less “guaranteed” and more “high success,” and the odds of success improve if you deplete a bunch of anti-missle defenses first.
3. Iran is fighting two nuclear-armed countries that have very recently shown they don’t care about civilian deaths at all. Trading Tehran for an aircraft carrier is not something Iran wants to do.

I would imagine that hypersonic missiles have reduced payload. I don’t know if the physicis situation behind them is widely known. It doesn’t seem to be talked about in the same way conventional arms are