Hey, I lived in Singapore for 8 years and through friends who worked in MBB, I know that work-life balance is a dreaded thing in that office and generally across the bigger offices in SEA. This is true of any sought after office around the world. But this subject has been much talked about over the years and sadly companies are using this as a marketing gimmick.
Based on my personal experience and everything I have seen in consulting, work-life balance is something you take control of and use the people/process/tools around you to make it happen. Its in human nature to go one up against the person next to you and this is rampant in consulting- so they slog or at least pretend to slog. Check out this thread for more insights on work-life balance: https://www.preplounge.com/en/consulting-forum/does-work-life-balance-improve-with-time-8445
You dont get into consuting to be loved but to acelerate your career, learn a lot and perhaps move out in a few years. Its like using the escalator vs taking the stairs.