This though - what? Are all software engineers like this guy? He's been there pretty recently 2019.
The whole thing with having a family / kids and atlassian is now facing a class action?
When I was young I slept in a HAMMOCK while working at the office. I now have a family. And yes, it is harder to get promoted, simply because I have less interest in working 90 hour work weeks! The guy took parental leave during his career growth (and was only there a bit before). I mean, your job is kept for you, but you are also looking to get promoted while not there?
Unlimited PTO is garbage. It means in consultation with your bosses and subject to their continued happiness and needs of company you can take time off. Reality is you get unequal usage - it's actually not FAIR, the nice person is to scared, the abuser abuses it until they run the risk of getting fired. Just do normal PTO plans folks so folks KNOW they have a right to their 4-6 weeks! I think unlimited PTO is the worst thing. This is not an atlassian thing though.
Hard to believe there is not more to this story just given the style of this guys writing.
My own piece of advice? Quit and get a better job. These companies don't deserve you. Why waste time on them? Every time I've done that (once) it was the best decision I made (ever). And if you think all managers are crap, become a consultant.