I left a firm and started my own firm 20 years ago and it was the best move I ever could have made personally, financially and professionally. My wife, who left Big Law after we had our second daughter, is also self-employed with a niche transactional practice working as much or as little as she likes from the comforts of her home office. We never miss a soccer game, a track meet, an opportunity to volunteer or chaperone, or anything else we really want to do.
I don't disagree with any of what you said in this post until your last sentence. The disagreement is that practicing at a Big Law firm is somehow akin to making 6 mill a year to coach a college football team. It isn't, from a stress, time, pressure or income perspective. Not even close. With very few exceptions, big law senior associates and partners make far less and work far harder and under far more stressful conditions than Pat Narduzzi does coaching football at Pitt. And there is no "fun" or rewarding element to what big firm lawyers do--none. Coaching football and mentoring college aged players is extremely fulfilling and there's a lot of joy in it. If you don't understand that, I'd say it's you that doesn't know what you're talking about.
Sorry counselor, you ain't winning this one. Clerk, call the next case.