I’m not an IT professional, but I don’t use antivirus software on my personal macs and linux machines- I do regular rotated physical backups, and only install software digitally signed by trusted sources and well reviewed Pirate Bay accounts (that's a joke :-).
My only windows machine is what I would classify as a mission critical hardware connected/control device, an old Windows 8 tablet I use for car diagnostics- I do not connect it to the internet, and never perform updates on it.
I am an academic and use a lot of old multi-million dollar scientific instruments which have old versions of windows controlling them. They work forever if you don't network them, but the first time you do, someone opens up a browser to check their social media, and the entire system will fail quickly.
My only windows machine is what I would classify as a mission critical hardware connected/control device, an old Windows 8 tablet I use for car diagnostics- I do not connect it to the internet, and never perform updates on it.
I am an academic and use a lot of old multi-million dollar scientific instruments which have old versions of windows controlling them. They work forever if you don't network them, but the first time you do, someone opens up a browser to check their social media, and the entire system will fail quickly.