We should remember the thri-keen with four arms can't wear most of jakets, shirts and other clothers for two-armed humanoids. Even some humanoids races shouldn't can wear hats because their heads are too different, for example tielflings with big horns.
No-core PC races would be better with the option of the racial feats.
I see the feedback is saying the PC races from "d20 Future" are wellcome in Spelljammer, and I am happy with that.
The return of Spelljammer could allow the resurecction of "old and forgotten" sci-fi franchises thanks homebred mash-up versions. And then the owners of these IPs maybe would accept some partnership deal with Hasbro to promote more those franchises. For example Disney's Threasure Planet.
Hasbro not only wants D&D multiverse to be a cash-cow, but to create a "metaverse" where all potential intercompany crossovers are possible, for example Ravenloft-Fortnite(mare) (Yes, a very wicked idea) or Spelljammer-Babylon 5(reboot), Robotix-Eberron or Planescape-Galactica(steampunk mash-up vesion).
About the scros, the Spelljammer orcs...please, they need a new name, the current is horrible, it sounds as scrotum. Why not "skraw" or anything like this?
* If the faction war ended within Sigil, this could continue in the gatetowns and the "wildspace".