As promised, I'm not going to go point by point with GS.
All his basic bluster pretty much comes down to a few points, which I'll address here.
1) Phoenix doesn't need a host to interact with the physical plane.
Untrue. All the examples you named were of Phoenix acting etherially. That even includes Le Bete Noir, who was a spiritual force who was punished by being given form. And don't tell me that it's not supported anywhere in the bio. Go back to my post about it - I quoted directly FROM the bio.
Phoenix, needing a host to act, sought out Necrom
Is there some part of that you didn't understand?
2) Phoenix doesn't physically overwhelm the host, only mentally
I'm not sure where this whole thing came from, or why you bothered devoting hundreds of words to the topic. I never specified whether the overwhelming is physical, mental, or spiritual. I just quoted the bio, which pretty clearly stated that the host ARE prone to being overwhelmed if given too much power. Again, I quoted her bio directly when saying so. What difference does it make HOW they're overwhelmed...just that the Phoenix is worried that they ARE overwhelmed. Even in your own scans, Jean says she dare not get too close to the Phoenix, or she'll be replaced.
That alone pretty clearly means that any host is going to only have a fraction of the true power of the Phoenix Force.
You also posted a scan of someone being unable to mentally cope with the Phoenix power. ok....we know that. Not everybody can cope with the idea of a second consciousness digging around in their head. Not everybody has the willpower to wield a GL ring, either. It doesn't make the ring all-powerful just because it takes a "special person" to wield it.
Phoenix avatars = Green Lantern corps.
3) All of Phoenix's pwnages are easily explained away
Yes, by the limitation of the hosts. Whether it's a mental limitation or a physical limitation, it's still a limitation brought on by the host. If the host is destroyed, that's it for the Phoenix.
4) Wanda's chaos wave isn't hers
Roma said it's originating from Earth 616. Meggan is standing on the other side of the breach, and seeing the chaos wave flowing from inside of Earth 616. When Rachael and Psylocke entered Earth 616, they were immediately re-programmed to fit into whatever Wanda's vision was. If it were just a regular altered reality, that wouldn't have happened. They were consumed by the chaos energy that was all over the 616 reality.
In Exiles, they said REALITY 616 was unavailable because of some type of blockage creating a haze they couldn't penetrate. Hmm...I wonder what that "haze" could be.
It's pretty obvious there was a constant energy matrix eminating from the Earth that was altering the entire reality. Who could have generated that?
5) Wanda only altered the Earth.
Um...Otherworld was affected. She reached into Dormammu's domain and yanked him out (DORMAMMAMU!!!). Clearly she's reached beyond the Earth.
Also, like I said, Exiles said the entire 616 reality was affected and unavailable. They ended up going in blind.
And in the scan I showed, we see planets crashing together, alien races, and Galactus.
No, it's not just the Earth.
Also, the idea that by altering Earth's history, she was able to, by extension, alter the history of the universe is interesting, but just brings up the philosophical point - if you can alter someone's history, aren't you altering THEM? Essentially, it IS of universal proportions, and you can make it so anytime you'd like just by altering history in any way you'd like. She made lifelong enemies into best friends. She created treaties and peace pacts and intergalactic wars all reach outcomes favorable to the people SHE wanted to win. Either way, it's speculation, and the additional evidence I cited all works in my favor.
Simple enough.