No one is denying anyone a healthy work life balance, everyone is free to make their own choices and those choices are all completely valid. If people want to work a low stress job like Elle's last job, or even part time, or even not at all, more power to them. But in Elle's case, she shouldn't call herself a practicing lawyer when she doesn't want to do the work required for that job, and or act like she's some sort of hard-driving #girlboss when she actually works less than most other people.
Some people like their jobs, want to use their skills and education, want more responsibility at work, not just to earn money, but they like what they do and want to develop and grow professionally. And as much as we rag on "profit-driven massive corporations", at the end of the day, they still provide good or services that benefit society. There's a lot of valid criticism of large corporations and the power they wield, but I don't think the work that people do should be dismissed as being useless or meaningless just because they happen to do it for a large corporation. Society ultimately still benefits from their work.
Long hours don't always equal efficiency, but working less doesn't always equal efficiency either. A lot of the time it just equals working less. I know people who work low hours who completely phone in their jobs and aren't good at their jobs at all, so I don't think any kind of generalization can be made either way about efficiency just from anecdotal evidence. (And I think that's a pretty broad generalization about the Japanese workforce, I don't think that's true or accurate in many cases). For most jobs with long hours, people have to work long hours not because they are just doing busywork, but because they have to finish the work that the client hired them to do within the time frame required, or to treat the patients that need to be treated, or develop and put out a new product on time, etc. Unfortunately, in this globalized world, things are very competitive and keep getting more so. If a law firm doesn't do their best, they could lose a case for their client because the opposing law firm worked harder. If a company doesn't do their best, they could lose a key customer or contract (like Intel losing Apple), or they could be late on the market with a new product and get their market share eaten away by someone else. Most of the time, the pressure and work isn't just for the sake of busywork, but to stay competitive.