It’s not auto exposure, guys. It’s 100% because they’re not using lumen. It’s because a dynamic skylight (without lumen) illuminates everything evenly. It’s the same as UE4. It doesn’t do any traces or anything so it can’t tell which areas shouldn’t be lit by the sky and which areas should. It’s a fundamental limitation of the dynamic skylight (without lumen).
If you want dynamic lighting without lumen, you’re going to have to suffer in quality. If you don’t need dynamic lighting, then bake lightmaps. Quality - Performance - Iteration time. Pick two