It's fun to sneak around in Cyberpunk. It would be even more fun if it was possible to do lethal stealth takedowns not just with your hands but with the melee weapon you have equipped. For example, I have a Katana in my hand. Does it really make sense to make a lethal takedown with my hands then? Or mantis blades. I think stealth kills would be significantly more fun then. Otherwise you have the weird situation that you sneak up on an enemy, hit him with a katana and still enter combat mode with everybody around although this should be deadly enough, to put it mildly.