I agree with all except maybe number 2. Years ago, when I first started building wheels, I assumed greater tension would make a stiffer wheel, but I was informed by others it would not, and even Jobst Brandts' book stuff it would not.
Then, recently, I had an employee ask me to tighten the tension on his rear wheel on his mountain bike because it wasn't stiff enough and was flexing enough to rub the chainstay under hard cornering. I checked the wheel, and it was already at decent tension (like over 100 kgf), and told him adding tension wouldn't help the issue, but I added tension, anyway, up to close to 120 kgf. Well, that did indeed make the wheel stiffer such that it didn't flex enough for the tire to rub the stay.
So unless someone can explain that better, I'm now under the opinion that more tension CAN make a stiffer wheel, since actual experience has proven it.
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