I quit some time ago, but I'm always open to giving it another chance later.
My reasons are first and foremost:
Performance: even with a mid-range gamer PC, I sometimes only have 20-30 FPS, in the long run it was stressful for the eyes.
Destruction: In contrast to a certain other game, a ship can crash and break down in the safe zone at any time, that was also the point where I gave up when my ship, which I had farmed for a week, crashed after a test flight. Bringing the ship back somehow and repairing it took a lot of time, and I lost the fun of the game.