Well, I can do hostility, if you really want.

But seriously, there is a conundrum for us that is both frustrating and fascinating. Sticking with Britain as our examplar, Cunliffe's massive body of work gives us a lot of archaeological material to work with, and we can can broadly identify at least two "cultures" that could fit well into the EB framework: the Arras Culture to the north (maybe the Parisi, or the Brigantes) and the Aylesford-Swarling Culture to the south (the Cassi and others mentioned in Caesar). From these sources we have weapons, chariots, horse architecture, household goods, votive offerings and settlement patterns. A lot, really. What we don't have is any written history until 200 years or so after EB begins, and since we don't do emergent factions, that's a real problem. There is a lot of coinage that gives us the names of Kings/Chieftains and indirectly indicates some of the political history, but these don't appear until maybe 150 years after our starting date, and are anyway probably a result of increasing Belgic influence (not invasion) in the southeast of the island, something which, in an alternative timeline, might not have happened as it did.

Bugger.

So what should we do? Clearly, there were people there deserving a faction, and probably more than one (if we had no hard-coded limits, of course). But we don't have most of the information that we would really need to be historically accurate as per our mission statement. We don't even really for sure know the names that the tribes called themselves in the 3rd century BCE, although 'Casse' is a damn good guess. We don't have any real battle narratives, so we have only a vague idea of what kind of units to model/skin: we have to retroject from Caesar and extrapolate from the physical remains. Which is fun, of course, but a lot more work than some of the Hellenic factions with (relatively) a lot of textual support.

Multiply this problem by every other area of the EB world besides Rome and the Diodachoi and you may begin to see why it's not done yet.

Oh, Cyclops, your poke in the eye with a burnt stick is on the way. With love from the Occulti.
Bwaa-ha-ha-ha-ha-ha!