Earlier quoted context omitted.
The biggest difference between hypersonics and swarms of slow missiles is that the hypersonics can get there fast enough that you might not need high-quality targeting information. That's definitely a strategic advantage! Also the 3M22 is estimated to only cost around 2 million dollars.
> hypersonics can get there fast enough that you might not need high-quality targeting information The strategic systems hypersonics are hyped to hit have been hardened against ballistics. Hypersonics are slower than ballistics. (Their plasma envelope also makes them easier to track by satellite.) This is a tactical evolution. Meaningful. Helpful. But not a strategic shift.
I agree that they're not that different from ballistics but they still have considerable advantages.