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Since you seem so interested, here is my source. Magnesium is 7th. I saw it on the internet, so it must be true :p....
Exploration. We need fog of war, or fast travel, or faster ships, or scanning capability with the radar dish.
Finding resource rocks in the first hour of the game - especially silicon, the most common element on our planet.
Pentaxide mining by far. Now with bigger moon ... forget about it. And resource nodes with 10 crystals? Why bother?
Personally I love the restriction of spawning on a base. Otherwise there is not much point in making a base at all - just go right to CV. It...
Suggestion for the radar dish (not currently supported): On a base, it reveals the planet map (resource and POI's) -- perhaps for your hemisphere...