The Beyoncé example is totally meaningless. Being a member of the media elite, she is also a product of her management. She gets her appointments and might have to say yes or no, but that's it. She probably has a personal assistant that does all her chores. She probably has an army of nannys and people who take care of her house. For some of the things mentioned her main involvement is signing a contract to make someone use her name. The real work for her is in preparing new music, rehearsing songs and choreography, and staying in shape.
I also don't like the underpinnings of the article - that sacrifice and hard work is always something to strive for. I'm totally fine with passion. Obsession. Sacrificing for a greater goal, ok. But work as a goal by itself, this seems like the wrong kind of value. It reminds too much on the old notion of protestant/calvinist work ethic, which seems completely arbitrary. One could also target "savoir vivre" or "la dolce vita" and start with a good night's sleep. The brain will be thankful.