Using scalable instead of high quality is an aspect. But you are working backwards to get to where you want.
Unreal tends to offer higher end features. Unity and Godot are like a blank canvas that you can add to. Out of the box, even stripped down, Unreal is just heavy with features.
You want to choose an engine that complements your art and design direction. If you don’t need expensive rendering don’t use an expensive renderer.
No one will stop you from using UE4 to make a low end game. The engine will provide that friction for you.