4 space and 4 ground sounds nice to my ears but 2 space and 2 ground would just be a pointless bit of aggravation. Everyone would just take the only two space skills that are noticeable.

That said, ground traits are more powerful than space traits but ground combat isn't a big focus for your average STO player. If it was we'd see more c-store bridge officers, more c-store personal equipment and devices, not a constant stream of new ships.

Edit: If they put out a chainsword, PowerSledge, Spacemarine armor, Flamethrower or some of the old borg gear as c-store items I might have to invest.