

Your argument is the equivalent of, “I saw someone get stabbed to death so you shouldnt wear your motorcycle helmet.”
I have no doubt you did see these things but that doesnt mean loud pipes dont add a bit of safety at the expense of noise comfort. Every bit of safety adds up and can save your life. There is no one thing that will do it but if you do enough it can have an effect. Maybe you didnt hear those pipes but a few hours later someone else did and didnt see them and they were saved.
The gravel one would make you rich pretty quickly depending on how fast you can conjure it.
The teleport 7 inches thing would get you through almost any door or fence including an most stud walls including vault walls.
Id pick the gravel one I think though. Again depending on how fast you can make it. If its a cup per 24hr then the teleport is where its at.