If bringing in 3rd liners to play 4th line is too marginal an upgrade to make for folks than so be it. I won't argue that,Are you remembering Armia and Tanev as they were when here before? Armia is 7 years older, 31 and Tanev is 6 years older and 33. Either might have more finish than Barron. Or maybe his production is just about limited opportunities and a little bad puck luck.
If they are an improvement it will be marginal and probably not worth the costs.
I just think having some cheap to acquire depth we know how to fit in makes sense as long as it doesn't preclude any bigger moves.