Earlier quoted context omitted.
The point isn't expanding your knowledge, but doing so when there's other priorities.
But priorities are just a personal preference and ever shifting. Sure sometimes there are external forces driving our priorities, like needing to finish a work project to get paid, bur once you've taken care of those, it's totally reasonable for "knowledge acquisition" to be at the top.
So mentally, you don't feel like your wasting time. Thus you consume more and more. Which for some, can create an addictive feedback loop similar but exaggerated as porn. Which ironically is wasting time.
Everything in life is in balance.