You can't know that many people like that, most people don't even have 3/4 kids so it's hardly like everyone is doing this.
Most people who are successful in their careers sacrifice something else- time with family, time spent on housework, time spend on self. They can buy in some of this- like a cleaner, gardener, but I don't know any working mum who is very successful who doesn't juggle like crazy and feel a bit neglectful at times- even the ones who are brilliant.
I have a friend who is super successful, two lovely kids, travels the world (in pre-corona times)- she has a partner who is at home working so can do pickups/school plays (she does what she can), doesn't spend a whole heap of time on self-care, stays up working til midnight and is permanently knackered.
How would people have time to have hobbies in the evenings, and four kids, and do lots of exercise, and have their hair done etc- think about it logically!
I look reasonably presentable, have a reasonable career, two children, home lived in but not dirty, but don't have a whole heap of time for hobbies/self-care/reading books as too tired most of the time and looking forward to bed. I'm acing it, frankly and even I don't do all the things in the OP.
The latest stats are women are doing more household chores and childcare in corona times than men, gap has widened, most people are muddling along.