@internic macOS user for around 49 years, yikes! Current macOS hasn’t really needed anti virus or anti malware software. Personally I’ve never used it on OS X. We used to use it in service bureaus back with the IIfx era of machine, and had a few hits.
If a friend asked me, I’d say no need. For you, I can only say what I’ve said, and suggest you do what makes you feel comfortable.
Too vague? 🤪
@internic First one I used but didn’t own was the first MacIntosh Classic. An eye opener, on which I drew a picture with the mouse.