Why would they need to be any more worried about those now than before?

The same holes exists and have existed for some time already. If he was not worried about them before why be worried about them now? And if you're worried about security holes why not be worried about the ones that exist now?

In general I find it funny that some people think that system is "secure" when it's on the latest version. At time t0 version N is considered "secure" then an update is made at t1 with version N1 and suddenly N is no longer secure. But it didn't change... it's the same version it was before.

Fact is a computer system is never going to be 100% secure.

Because the longer software is out in the wild, the more vulnerabilities are found. At least when they're found in windows 11 they should be patched