you must have never worked in a corporate or enterprise environment.

I'm a security engineer and we work with this stuff daily. In fact most enterprise endpoint devices (laptops, phones, desktops) have not one but several security software by different vendors for different purposes.

Antivirus, firewall, proxy, VPN, monitoring, ....

We have a small desktop farm environment and a handful of devs with Linux laptops, they all have defender installed.