Spot on and couldnt agree more, had many tuners give me different advise in my 9 years and 5 cars of Rx7 ownership, as i am sure a couple of ex members that are now on here can confirm, the bitching that goes on within the Rx7 forums regarding tuning is at times laughable for adults, one of the biggest ones over the last few years was simply down to fuel pumps of all things.
However, i still think, as you say, alternative comments or views are good, but need substantiating as to why, to allow people to form an opinion based on facts, not just "x said x about x"
I would imagine its the heat and also possible metal wear/fillings that may collect over time