I could say that we spend more time at work than with our family - ~40h. Why are computers worse?

Yeah, this has always been my take too. Assuming an even 8h split on weekdays, the awake-not-working time is heavily eaten up by commuting and general upkeep. Family squeezes into shared upkeep and any remaining time at best.

The two weekend days don't seem enough to catch up to the accumulated work-time, especially if your commute is relatively long (which is true for a large chunk of the USA), so you're just constantly in a deficit until you retire... which is more of an "if" than a "when" in many cases.

Which is clearly a problem, but I don't think computers are the cause.