https://www.vice.com/en_us/article/88qyy5/us-government-report-shows-why-russias-hypersonic-superweapon-claims-are-dubious

Hypersonic weapons are all the rage right now, with Russia and China both positioning the ultra-fast and maneuverable missiles as nigh-unbeatable superweapons, but a new report from Congress pointed out the new weapon’s limitations and highlights that there’s still a long way to go before they’re a reality.

The fancy new weapons run super hot during testing, which can cause them to manufacture, according to the report. They’re also billions of dollars more expensive than cheaper alternatives that perform just as well in most contexts.