well, whatever the reasons, past or present, the single-flight rule no longer applies : personally, I have no issue with it either way : I dont over-supply to that extent because I consider it a waste of tin and resources better spent chasing actual unfilled demand elsewhere. I dont consider it a dis-incentive to competition either : I actually think it a sign of weakness, the player is flying empty seats and must be under-pricing to get anything they can onboard ; ergo ; they aint making as much money as they could be : thus they are more of a target, rather than less.
I do see one area which I would like explained further though : part of the pricing changes was, as I recall, about being able to 'grow' demand : a good offering would attract demand above the stated level : part of adopting that strategy must involve a degree of over-supply to accommodate any such 'demand growth' : I can see that being a tricky balance to achieve.
With reference to worlds like JA : demand is pretty low all round ; I'm opening routes in the hope of being there to take advantage when demand does grow ; with a full RI, slots paid for, etc. but, of necessity, over-supplying is unavoidable in that case. Well, seat-blocking will work fine for me, but I do see it being an issue for newer players less familiar with the route-creation now having to consider that in planning as well.