Sutter said:
Given enough time , Qui-Gon would have made his way through how many layers of blast doors?
Bolded for emphasis. This is exaxctly the point. Breach is the kind of power you need to cut through a blast door with a combat maneuver. Qui-Gon was using a lot more effort than a combat maneuver to cut through that door.
That doesn't mean that a lightsaber shouldn't be able to cut through "just about anything" given enough time and effort, but that's not really what the Breach quality represents.