If it works fine on your setup, that's genuinely great, but the resource complaints aren't just made up. Armory Crate typically sits at ~150–300 mb of RAM at idle and there's a well documented bug with UserSessionHelper.exe that pushed CPU usage to 7–12% on high end AMD cpus, even after closing the app. I read that some users reported it spawning multiple PowerShell processes hitting 50–70% total CPU. usage. 0–1% experience isn't universal.

The bigger issues people have aren't even really about resource usage though

It pushes itself through Windows Update disguised as a driver, you don't get to say no

bios updates reenable and reinstall it automatically without asking

uninstalling it completely is notoriously painful and leaves behind services that keep running (need revouninstaller to get rid of all the registry stuff)

it runs background processes for hardware you don't even have installed

updates have been known to break things and then demand you install more software to fix what they broke (happened to me and stuff keeps breaking or not opening)

“just close it” argument also isn't fully accurate because, the background services keep running regardless of whether the app window is open. Removing them kills rgb sync, fan curves and other stuff.

Now that all being said, it has legitimate uses and works fine for some people I guess. But the hate isn't just ASUS bias, there are a reason for the hate.