Both of my parents worked full time. Neither of them seemed burnt out. Have plenty of friends where both parents work, neither seem burnt out. I'm always curious what makes it work for some an not others. Some of these couples are not high paid tech workers either. I'm even more amazed that some still find time for hobbies some how.

When you are at the age to notice your parents well being, you are no longer a young kid. Little kids are extremely demanding, both physically and mentally. That’s not to say it gets any easier, but when you aren’t sleeping for 4 months it hits totally different.

When you have over extended responsibilities you have to readjust expectations. Some adults never learn how to do that and feel miserable all the time.