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I don't know of a canonical XP team size, but "small" is the normal recommendation. 8-12 would seem larger than small to me.

Personally, 8 is the largest I would have a team. At that point you should consider breaking it into two teams of 4 (even if those teams periodically recombine from the original set of 8 people).

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I find it non trivial to split a team in two independent teams.

If the two teams have to coordinate a lot and work on the same code base, is there still two teams?

To be independent, they would need to work on functionnaly different parts of the project. Not all projects have several independent parts, feature-wise.

What do I miss?

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