The bad ones they do, especially early on.

The ones they don’t back port are usually dumb stuff like “if an attacker has root and has you at gunpoint, a flaw in wallpaperd may allow them to change your desktop background”

In my experience of you're on currentVersion - 1 the security is just as good.

All I was saying is it's (imo) madness to upgrade immediately to the latest .0 version of macOS.

The long key press for diacritics is completely broken on Tahoe : white text on a white background.

All Electron apps are a bit broken until the vendors update.

There's probably more problems.

Depends when, before they hit the X.1.0, yes they do backport all security patches. I’d argue they actually do until .2.0, but that murkier.