There has always been a need for out-of-game or third-party information to do things in the most efficient way.
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It used to some in the mail along with letters, which were white rectangles made from trees that people used to scribble on with ink sticks.
In any sandboxy style environment, there should not be any single 'most efficient way'.
Also, Earthworm Jim is really a psurlon.
The presence of another player can only ever be a disadvantage; at minimum you will have to share materials and scans with someone else.
Unless they don't need them and can provide cover and backup.
I've often found safety in numbers more than advantageous enough to overcome any resource contention issues.