Fidelity and stability in all ARPGs is wonky… Strategy games suffer the same thing due to the isometric nature of the game and many actions or entities on screen.
People that tell you PoE runs smoothy and has no screen tearing or foggy edges is just straight lying to you or hasn’t built anything past a basic build at level 40.
The game is sharp early stages but all ARPGs late game suffer visual clog and that extends to AA and screen tearing.