Airlocks
lack of being able to close your own airlock so you can get camped in it is still a major one, the airlock camping, loud af noise and staggered raid entry is a big downfall as it stands currently.
Progression system
Progression system really isn't there yet, still not enough in place to keep people on long term.
ZtH is linear and ideally would be better with forked progression for each of the factions.
Maxing out traders can be done quick and they do not offer a lot at all. Pretty much every update has seen something getting removed from the stores.
Ship Customisation
Ship customisation an arguable extremely unique mechanic was completely scrapped with no word on it being re-added any time soon.
Weapon Customisation
Weapon customisation is still a pain in the ass because none of it is available in the stores bar some attachments for low tier weaponry.
Every single blueprint is locked in a vault / depot aswell. Could easily add some lower tier blueprints to the loot pool outside of them, hell even load some on the AI.
Stash
Please implement a Ctrl+Click from stash to the player gear, it only operates one way round at the moment,
such a small change that would save a ton of down time.
