> On the other hand, half a year ago I've investigated a compromised macOS system at work where the user clicked a wrong button on some innocently looking dialo

> On the other hand, half a year ago I've investigated a compromised macOS system at work where the user clicked a wrong button on some innocently looking dialog and ended up with a rogue extension in Google Chrome which was not possible to uninstall. Why didn't SIP prevent that from happening? Because a Chrome extension is not part of the system. The clue is in the name, System Integrity Protection. Were Chrome extensions something that interacted withe kernel, or other system functions, you'd have a point. Arguably XProtect could've kicked in, but now would expect the software running the extension to have reasonable protection agains that sort of thing.