as Cmacq mentions, subjective is exactly the case. Raetians are certainly NOT proven to be non-IE... the question remains, how do you define Raetians? I do not think of the Etruscan and related non-IE cultural influx as 'Raetian' even if they came to define the later identity. The true Raetians are possibly from neither group, but such an unknown group certainly shouldn't be considered any way for certain... again, language evidence from the area might indeed prove to be non-IE, but that doesn't mean THEY are Raetians... there are quite a bit of important and very different barbarian peoples who have inhabited the Alps and during the ancient timeline.
Halstatt / La Tene culture has had a very unique and important place in history but it is in many ways not beyond that of any extension of common Indo-European culture. That same Indo-European culture, not yet progressed into Bronze / Iron Age delineations can easily explain any resemblance between names, identities, practices, ect... even specific differences between Satem and Centum language-speakers break down across the 'Borderland.'
as Cmacq has mentioned, echoing what i have found myself in the studies of the area, the Nordic Bronze Age and other cultures have had important influence on the area of Poland thought to be the Venetic Bay but so 'discrete' that the people can't even be called Baltic, Germanic, or Celtic in basis. They could easily have been a Finno-Ugric or undiscovered variety- all we know is that the Goths / Wielbark culture certainly DID become dominant and subsequent cultures are known... Przeworsk is still quite a mystery, despite it's interesting relationship to Oskywie (Wikipedia doesn’t even have an entry on these guys- I guess they're not as fun as fiends of Rome), Lusatian and Pomeranian cultures, besides specific varieties like the Face-urn culture are strongly tied and yet still much undefined in basis beyond the material evidence and unique cultural spread which defines everything in the first place. Much interesting conjecture can come from this but we'll never be able to say much- especially since there is nowhere near the interest as Mediterranean peoples have had prior to habitation of Industrial peoples... some materials and some of the environment doesn't lend itself well to preservation either.
Elmetiacos (sorry I misunderstood your comment on Celticity)- and to others, you might be interested to know that I have suggested for EB2 a less Celtic-like / Centum form of the spelling and terminology of their name on the map, even if Veneti still are the best name for the area at that point in time.
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