This guy explained it...
Hmmm... I have some theory:
At the beginning Gearbox outsourced creating game to company X. Company X prepared "Demo", but informed Gearbox that game budget is too low and they need more money. Gearbox fired them and takes cheaper company Y to prepare game... But company X had all rights to assets that they created, so Gearbox/Y cannot use it... So company Y prepared it again in much poorer quality....
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