This makes sense. I had experience working with the game in the summer, capturing footage at Sega QA. Getting the footage was a mess, there was a lot to fix. A LOT of dodgy/missing animations, shoulder lights randomly turning off, characters always staring DIRECTLY INTO THE CAMERA (you can see how thats a pretty big issue), characters guns not syncing up with their current pose, limbs going crazy when guns were swapped, GUNS AND CHARACTER MODELS MISSING FROM THE BUILD THAT THE TRAILER WAS SPECIFICALLY ADVERTISING, etc etc.
Over the month or so the project ran, multiple times lists were sent to Gearbox to fix what really should have been basic stuff, and every time a new build came back the changes were minimal. I'm surprised the trailer came out as well as it did all things considered.
Saying all this, I also didn't think the game would turn out too bad. The gunplay felt solid and I really liked the lighting. It was also Summer so it seemed like there was enough time to get the game in a good place. I also thought the main menu was sick.