You're a lot more likely to be aware in the present moment when you're deep in a 'flow' state doing something productive than when you're just sitting around doing nothing. Why do people assume that idleness is something to aim for, and enjoying real productive work is not?
I start my day with deliberate idleness. Just coffee and music in my living room, or tea on the balcony.
Productivity needs purpose and direction, and you find those through pausing and looking around you.
This reminds me of our painting teacher randomly forcing the whole class to put their paintbrushes down, take a step back and see if their painting still makes sense. Otherwise you get stuck on details while your perspective is all wrong.
The two states are in no way in opposition to each other. In fact, experiencing deep meditation can improve one's ability to get into that desired productive flow.
Why do people(you, in this case, but this is a very common fallacy) assume that advocating for one thing(idleness) is implicitly advocating against its opposite(work)? We can do both, just not simultaneously.