For me the biggest problem is the sparseness of the galaxy, since this is even worse on console than PC.
Thus I'd like persistent cross instance wakes with a long time decay weighted by things such as notoriety, bounty, rebuy, cargo value, highest PF rank. Then folks could actually pirate and bounty hunt and such.
Removal of engineering or make it so that once you've engineered something, it's forever unlocked and mat free, such as guardian tech. Because the 2nd biggest problem for me is non-consensual PvE grind.
After that, pretty much anything meaningful to pew over would be nice although much less of a requirement as I like the nonsense we come up with ourselves better than any plot type stuff FDev has come up with.
(Of course #1 is no clogging or menu logging).