As a point, have any of you actually read Starfinder? I'd only breifly browsed it before, but got hold of a copy and read through a bit (first edition).
If you assume it's all D&D in space... you're wrong. Yes, it has the same basic stucture as Pathfinder, which is basically D&D 3e, but the character options are not a simple port from fanatasy. All the racial options are original aliens, plus humans and androids. An insectoid one, a reptile one, a psionic one (which has two sub-types that are fully interfertile), a four armed species that arrived in the system from far away that's bound up in ancient tradition, and ratfolk (in the furry animal mode, not the chaos born Skaven mode). Straight away, this feels more like Star Wars without the baggage, or Guardians of the Galaxy, or Farscape. The fantasy races are provided in a "Pathfinder Legacy" appendix; while Elves and Halflings exist in the galaxy, they're not presented front and centre. The Pathfinder world itself, Golarion, mysteriously disappeared milennia ago. So while there's a direct link to the FRPG in the lore, it's not really a distraction either. Lots more aliens in supplements.
Classes are sort of split across Themes and Classes. Dunno if that's a 3e or Pathfinder idea, or something Starfinder invented, but it's a good one. You pick one of each; there's 10 themes and 7 classes, so 70 combinations of "who you are and what you do". Themes are never changed and seems to be "who you are". Class can be changed every level, so is more "what you do". Comes out as broadly similar to Traveller career assignments (of which there are 36 plus the Prisoner and Psionic ones). Neither game is shorting its players for backgound options. The themes are all solid science fiction ones (Ace Pilot, Scholar, Spacefarer etc); the classes aren't direct maps from Fantasy either. Envoy, Mechanic, Mystic, Operative, Solarian, Soldier, Technomancer. Solarian in particular is odd - it's sort of a fighting class which draws from a connection with stars to grant a special weapon or armour. Envoy could be considered Bard, but is far broader than that. An actual performer is probably an Icon Envoy, but that could describe a working Royal or Spacebook influencer. A traditional roguish Bard might be an Icon Operative. There's a lot of flexibility.
So, to me it seems like an acessable, fun game with lots of robot and alien options. And starships. Plus magic... but that's probably not a downside to the players coming in. It ends up being about the same as in Shadowrun, or Marvel. Tech, Magic and Technomagic.
Mechanics are familiar, and really aren't terribly different to Traveller - d20 vs target with mods vs 2D6 vs target with mods, roll damage. The big difference is Starfinder armour makes you harder to hit, Mongoose Traveller armour reduces damage. I really doubt either mechanic is confusing anyone or discouraging people from playing Traveller.
I actually found all the various options, skills and feats a bit overwhelming to be honest. Traveller is a bit more straightforward there, and ONCE EXPERIENCED probably better for absolute beginners. But new Starfinder players with any 3e onwards experience (i.e. most of them) are used to how all that works, so for them that's a feature, not a bug.
So that's what the market leader is. The magic and mystical stuff looks easy enough to ignore if you want a pure tech game. Technology based characters can fill the support roles that wizards and priests do in Fantasy. I'm sure someone's done a product or article with guidelines for that, or a Psionics only approach.