To be honest, about 80-90% of SF shows could do with having some kind of consultant, even just one person, who operates as a sort of sanity check in a non-fan-ish/yes-man way.
Notably Stargate SG1 did have this - they had a guy who acted as their science consultant, and I think he was also ex-military (or even embedded military or something weird, I forget) - and it was incredibly obvious the influence he was having on the show, because this very low-brow action-oriented barely-SF show had a lot of bizarrely well-conceived SF ideas replete with strong science-rooted explanations, which frequently massively elevated the show - they also got facts right about weapons and stuff more often than was remotely common at the time in action shows. I dunno if he was on SG: Atlantis (haven't watched it), but he was also on Stargate Universe and that was also reflected in a lot of the plots being much more science-informed and intelligent than was at all normal then (or sadly still is) in SF.
The trouble is, Favreau, god bless 'im, is likely surrounded by yes-men, and has had a long and very successful career (and indeed is arguably self-made given his career comes out of him making a small-budget ($200k!) movie which was a big hit - Swingers (1996) - and building from there), so I very much doubt he sees the need. And Star Wars doesn't really need a science consultant, but he could definitely use some kind of sanity-check guy.
Also, continuity-wise, I was surprised at them having quite so many people with jetpacks - I am I forgetting or didn't those have to be earned? Seems unlikely all these dudes who have like just a helmet and 1-2 pieces of armour would have earned a jetpack. Maybe the Armorer is lightening up on that too though.
