Alright so I've got some confirmations, You can clearly pass Strong Integrity without PlayIntegrityFix as a module* but not on Legacy root solutions (Magisk) as droidguard (gms) has implemented checks to prevent it from passing integrity and therefore you need to use pif, On new root solutions like KernelSU + SusFS you are free from pif hassles as it hides custom rom, mounts and so on pretty well.

Furthermore if you have internal hooks that spoof your device and don't rely on pihooks props, there will be no way to disable them and you will be left trying FrameworkPatching.

Fortunately PixelProps work with and without Pif for the sake of your integrity.