All the human originated technology seems fairly plausible in the Expanse.

All the proto-molecule derived stuff isn’t particularly plausible, but it’s not really worse than most sufficiently-advanced-technology tropes, and it tries pretty hard to express a universe with rules, just different rules.

I would give Star Wars an F for science-y-ness, Star Trek a varying score depending on the episode (ranging from A to F) but overall a C, and The Expanse a B+.

It is galling when people define sci-fi by its cinematic imitators, for sure.