Spoilers from the Expanse ahead...

The protomolecule turned people into vomit zombies with a collective hive mind that could communicate instantaneously across the solar system and move an asteroid defying all laws of gravity, with the ultimate secret intent of building an interstellar wormhole.

Again, in the series (at least early on) humans are quite limited by known constraints and it would easily be considered hard scifi in many regards. But its central conceit was no less blithely nonsensical than that of TBP's - I simply can't understand how someone could put one in the hard category but disqualify the other.