Labeling people who demand reasonable work-life balance as "slackers" (from JD's CEO) or lazy is utterly disgusting.
I understand sometimes people might need to work a bit overtime to get things done or have on-call duties. We all do, but working 12 hours a day/6 days a week is not sustainable whatsoever. Of all these Chinese entrepreneurs, none of them mentioned even the slightest of their total rewards systems, which makes me think they are avoiding this topic on purpose and all their comments are attempts to put out fire while keeping the status quo, sneaky indeed.
To be honest, if someone I manage constantly works crazy hours with no rest for a long period of time, voluntarily or not, I won't even let him/her push any piece of code to production.
Fried brains == Disaster
Edit: had a discussion with some of my friends from China on this. One of the common arguments is "why are developers whining about work conditions while tons of other occupations such as factory/delivery workers and nurses work long hours with lower pay?"
First of all, other occupations having bad work condition does not justify the legitimacy of 996. This is yet another common logical fallacy when it comes to arguments like this. Also, how can people assume workers of other occupations are fine with endless long hours? Did anyone consider the possibility that they never had a systematic way to express their dissatisfaction and just tried going along with it for as long as possible before they were burnt out and got replaced?