I suppose my main complaint on poison darts is this: In so many video games there is the silent knock out weapon to allow for a stealth and/or pacifist play style. This game mechanic doesn't translate well into the Cyberpunk universe. Leaving a trail of unconscious bodies that, while you may have to hide them, but don't regain consciousness or bother you again, doesnt't fit. They are effectively dead, there is no worry of revenge form these characters. In Cyberpunk "Because he saw my face" or "She could find out who we were" are perfectly rational reasons to kill someone unlucky enough to cross your path. Those you let live will want to come back to even the score, regain their lost reputation, or are just one more goon that your enemy can throw at you later.
A pacifist play through should be about more than weapon choice. I should be an ethical choice that influences all of your game play. If you want to be a pacifist then don't kill people and make absolutely sure to leave no tracks, or accomplish your goals through financial/political influence. To a true pacifist defense is as unsatisfactory as offense, don't pick up a weapon and don't put yourself in a position where you might have to defend yourself to survive, it is not about not killing, it is about not committing violence.
In Cyberpunk, when you hire a Solo wet team to execute a live extraction their first question is "Does an intact, cryogenically frozen brain count as alive? Please?" Going non lethal is dangerous in the real world and even more so in Cyberpunk given the level of augmentation that exists, the ability to perform stealthy, instant KOs is greatly reduced. And if you fail, you need nerves of steel to face down your opponent, who is likely to use lethal methods, with whatever non lethal weapon you have. If you are going to fight, win!