The millions of WD Users are ok with it because they don't know what their computer can perform like without WD.
I can tell because I know my laptop inside out, I have a fast laptop, all SSDs, not a single HDD in it.
Let me just give you one example.
I have a software folder that I place all my setup EXE files in AND folders of portable apps, like CCleaner, Revo Uninstaller Pro, etc.
Each of those folders has a custom *.ico icon that I assigned to make them stand out easily.
If I have Windows Defender on, every time I access that folder, the icons would load in slow motion, one by one,
because WD keeps scanning the same files again and again every time let alone how slow it does it.
With ANY other AV, the icons and folders load instantly. Go figure.
Other than that folder example, I feel a whole drag on the system during normal day to day operations, installing large apps,
like Adobe CC Suite, takes twice as long with WD enabled!
Oh and before you tell me my computer is slow, here are the specs, if this can't handle such basic tasks with breeze if WD is on it,
then I wonder how your so called average joe is ok with his system's performance.
MSI GT73VR Titan Pro-425 | i7-7820HK | Kingston 2400 MHz. 64GB DDR4 RAM | GeForce GTX 1080 | Dynaudio System with Nahimic 2 Sound Technology | Killer™Wireless-AC 1535 | Chi Mei N173HHE-G32 17.3" FHD 120 Hz/5ms Screen [G-SYNC] | 2x Samsung 960 PRO 2TB + 850 EVO 1TB + 850 EVO 4TB + Sandisk 512GB Extreme PRO SD Card | Windows 10 Pro