There’s a decent amount of evidence that they weren’t given the time they needed by Rockstar, that they intentionally shipped it out with a shit ton of behind the scenes files in an attempt to assist modders (at the very least it was shoved out the door so fast they didn’t have time to clean the files out of the release directory, holy shit), and members of the studio have repeatedly and consistently reported that they were not permitted by Rockstar to release many bug fixes after the remasters released.

Rockstar holds the biggest blame for this one.