For all its faults would we be having this discussion without TT?
Problem with the UK and most of northern Europe is the lack of texts, if you look at the Greek, Roman, Egyptian, Assyrian etc etc. you have a mix of texts, inscriptions and archaeology. If you accept that that the histories are incomplete and always a writers opinion, then look at the ground it can answer many questions. In the UK their is a paucity of text, what you have cassius dio and a couple of others isn’t exactly balanced. Druids, human sacrifice, these are recorded, whether it is true or Roman slander of barbarians, well….
When you get into the Roman Era and post roman there are texts that can be related to finds, which helps with the context.
But context is everything, after all it is for the most part all that exists.