Why can I not maximize Activity Monitor to full screen?

I am unable to find any meaningful answer anywhere else on the internet. You can maximize Safari to full screen. You can maximize Pages to full screen. You can maximize most of the general use native macOS apps to full screen. But you cannot maximize Activity Monitor to full screen. Why? I have a dual monitor setup and many times I'm running a program on one screen and want to monitor its use through Activity Monitor on the other screen. On clicking the green button, Activity Monitor does not go 'Enter Full Screen', but just 'Zoom's to use the whole screen.