https://en.wikipedia.org/wiki/Tapestry_(Star_Trek:_The_Next_...
I try and conduct myself in a way that future me could look back on present me and say "past me took advantage of life experiences that were only available at the time" (think: youthful adventures, travel, friendships, etc.) but also "past me did a good job of setting present me up for happiness and fulfillment" (think working reasonably hard, being conscientious, financial responsibility, etc.)
Thus, people looking back have more information to work with and where risk adverse so they likely worked more than they should.
Whatever it is you need to do, get it done during normal business hours. If you can't manage that, find another job.
Most people working in "tech" are implementing business functions and processes, and are answerable to people on the business side of things. Academic R&D is a whole different animal.
Of all the people I can think of, my future self would absolutely be on the short list for who I would like advice from.
My older self can definitely advice my younger self to not work so much and so hard, without meaning that I should "relentlessly prioritize relationships". (Edit: I already prioritize relationships, but not relentlessly)
In my eyes, this is nothing controversial at all. In this thread I am surprised that the concept of "deathbed advice" provokes so many people.