Definitely agree that Macs have traditionally been less of a target, but not immune from security holes. I worked in IT for twenty years, cyber security for seven of them.
Do you need anti-malware for a Mac? The responsible answer is "probably yes", kinda like if someone were to ask if they should have insurance on their camera gear. Practically, at this point in time, possibly not.
In many ways it's a risk decision like insurance. Anti-malware solutions are meant to reduce the impact of malware, but if your likelihood of compromise via malware or an unpatched system is very low, then it might be reasonable to accept the risk and forego an anti-malware solution. One way you might mitigate the risk without AV is to practice all the good security and backup practices. Staying up to date on patches, ensuring frequent offline backups, not reusing passwords, etc.
