System Settings Asking Me to go to recoveryOS and change system security to allow kexts

After installing Xcode Command Line Tools, the System Settings App now asks me, to reboot my machine into recoveryOS and change the systems security to allow kernel extensions/ system extensions. It's not prominently mentioned, but just there and I never, ever had this. Must be a new dialog. Well, if you click on it...

My Question is: Why? Kernel Extensions have been deprecated long ago (I thought) and the dialog mentions nothing specific.