I know I'm not going to convince you, because you can be very stubborn when it comes to the definition of things (re : empathy vs compassion), but I think work-life balance does exist. It's not a unicorn, it's just a normal thing people have to manage.
I've had projects where the deadlines were extremely aggressive, and to meet those deadlines we all had to put in so much work, at one point I worked 24 hours straight. Our work-life balance was terrible, everyone was miserable, but we got it done. At the time we were proud of what we accomplished... but we all know there was a huge cost to our lives.
In hindsight though, I wish I had pushed back or left that project, because all we did is confirm to management that they can abuse us and get away with it.
Now I'd prefer to let a project fail if they set unrealistic timelines because I don't see any reason why they should be successful after failing to plan appropriately.
Good leaders ensure their staff have a good work-life balance by protecting them from unreasonable requests, and bad leaders ask or demand their staff to work more than they are getting paid to.