Valid points if I'm honest and your allowed an opinion bid
I'm trying to remain subjective as such and not have a bias. Truth be told. I work nights and I sometime don't get home till 2am in the morning. Plus I live in a cul de sac so I'm semi surrounded by houses. The closed valves is useful then. Also pulling out the street i use the closed option. I'm not saying this exhaust is the best thing since sliced bread but it's a good alternative to the likes of ipe and kreissig.