Yeah, it wasn‘t about the Lost Sector itself. It was bout entering a cave, shooting crates, back out and repeat. They basically said „Hey you idiots, we know you want to exploit the crates as a fireteam to do it even faster...well, f*ck you! You can grind the boss and chest now...as a fireteam, yaay!“. I just don‘t know why they have to hide it in between the lines and a lie.