downsides of graphene OS and other phones that support it. please advise?

hello,

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did some research about this OS and i want to really go with it.

so far i can think of pixel 6 as a "host" of this OS, however i find that phone extremely large! but, small sized ones are much weaker in specifications, e.g. ram, camera or cpu

i checked and phone from seller has option to enable custom rom.

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got few questions:

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are google pixels the only phones that could host graphene OS?

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graphene phones privacy support