Chirada doesn't do Wicked Wheel and I'm pretty sure Suparna stops doing Wicked Wheel after Chirada dies (please correct otherwise), so neither strategy should require the DPS to avoid Wicked Wheel. Downburst (the stack mechanic) is cast after Friction, so really the DPS only need to stack after Friction is cast meaning that even a 4 melee DPS composition would only have 1 melee DPS not getting positional bonuses (the "tank").
DPS in WoW only DPS. DPS in this game are expected, and fully capable, of doing more than simply DPSing. They have Class Skills (Featherfoot, Keen Flurry, Fists of Earth) and Cross Class Skills (Foresight) intended for light tanking.
I'm not implying either strategy is "better" as that's a bit subjective, but the NA method is basically throwing more mechanics at the tanks and healers for the sake of giving the DPS less to worry about, hence why I said it's making up for DPS that fail at mechanics (which it is).
For a tank going in there at ilvl 65-70 there is very little room for error on NA method, even if the tank is utilizing CDs properly. If you go in there with ilvl 80+ gear, which the majority of groups running NA strategy are in, then this doesn't become an issue because of the larger health pools. So yes, I would say that utilizing this strategy is artificially increasing the gear requirement for the tank and possibly healer role. It'd be like running Hydra and having the off tank pick up the adds so the DPS wouldn't be inconvenienced and having the main tank solo Hydra; it's possible if you over gear the content enough.
Once again, I'm not saying one is better, but implying that the JP method is for fail tanks seems quite silly considering the NA method is just throwing more mechanics on the MT so that the DPS don't have to think about mechanics.
I agree with everything you said. People see one strategy that works and take it as optimal without thinking of how to better improve their tactics. Just because something can be made to work doesn't mean it's the best way of doing it.
One clarification: what are you referring to when you say 2 and 3 stacking?