Microsoft's new security tool hopefully fixes the worst part of Windows' antivirus software
Microsoft Defender is good, but it still has its flaws.

Say what you want about Microsoft's security apps, but they've come a long way since their introduction. There was once a time when recommending that people use Windows' built-in antivirus app was a death knell for their computer, as the app would take up a ton of resources and not do much in terms of preventing malware.