User blog:Hitoriki/Question about the Phoenix Force

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I am currently reading "Avengers vs X-Men" and I am finding it quite entertaining.

I have just noticed that on it's way to Earth the Phoenix Force has laid waste to a number of planets without much resistance and then I noticed Captain America mention to the troops "For those unfamiliar... It's a destructive parasitical force of cosmic proportions that latches on to a biological host, it then uses that vessel to lay waste to the surrounding environments."

Now I am not a Phoenix expert or Marvel expert or anything this is a genuine question... Why does the Phoenix Force need a host? The Secret Avengers were unable to phase the Phoenix Force, Hala and Kree Spaceships were unable to budge the Phoenix Force.

It is stupid to suggest that the Phoenix Force would be better off without a host as Jean Grey was able to save Earth from it (again not an expert) as the Phoenix Force seems very capable of destroying/consuming (whatever it is doing) planets independently.

Anyone have any idea? Am I missing something?

Anyway,

Thanks and looking forward to responses