Disagree. This kind of comment is furtively pulling up the ladder behind you. Do as I say not as I do. Junior is the time to learn as much as possible and take risky bets (and suffer accordingly). When I was in a junior in a factory, the night shift knew me well. Nowadays, I've pared it back to 50 or so hours per week, because I now have a family, which is fine but it came at the cost of basically zero time to learn or do things other than what my manager asks.

I hope they were work-life balance boundaries

So it's the kind of work place where you have to set boundaries? :)