Please stop apologizing for Apple's customer-hostile behaviour here. A $2 trillion company should be able to make an external monitor not look like blurry trash when connected to their hardware.
The fact that it takes someone to make a third-party app to fix what Apple can't speaks volumes to how much they care about/understand their customer base. Apple should have tested M1 hardware with hot garbage external monitors, realized the customer experience sucked, and fixed it.