I think there’s something they want to keep secret, like perhaps other countries have missiles that are stealth.
When the Russian hypersonic missiles arrive in Ukraine, I’ve read there’s less than a ten second heads up to our patriots. I am terrified of the specter of a barrage of these aimed at one of our carriers. I fear the Aegis protection might be catastrophically overrated as well.
Other countries have low-altitude missiles that are supersonic. Russia shot a few into Ukraine. Low and fast. Hard to defeat at the moment but hopefully technology will improve. And hopefully they don’t have too many of them and haven’t sold the tech to Iran or China.