Stealth Signatures
Crafting
Engine Tuning
Weapon overclocking
Ship Computer overclocking/upgrading/customizing
Ship to Ship Boarding
Capturing and stealing ships
Capturing and owning space stations/ mining stations / factory nodes / capital ships (all of which are persistent in universe and must be guarded 24/7 to insure ownership)
Multi-Crew ships
EVA Reapir
Medical ships
Perma-death
Thats just to name a handfull
Yes Really
Of that list, only 2 are worth anything in my opinion, ship to ship boarding and multi crew. Everything else has been done before or offers very questionable additions to gameplay depth/longevity.
I guess it's a matter of perspective as one of my biggest gripes about Star Citizen is how completely unoriginal it is, in virtually every aspect.