why do easton arrows come with tuning stones
To clean up the SHAFT after it is cut so the insert will fit square to the shaft.
have over 20 years shooting
I have 48 years of shooting and have shot against and with the best in the world including the 1980 Olympic gold medalist.
In only 1 of the links you supplied did the writer say he aligns the blades to his feathers and that was the Basspro shop guy.
All of the others say to have the head square to the shaft.
Nothing wrong with posting tips and tricks just make sure the information you are giving is the right info as said before PSE busted the myth of having blades aligned to the fletching.
If by doing that makes you feel good then so be it.