When I talk with these engineers about what they actually want, it's not time to goof off and play ping-pong or cut out early. Rather, they want to be given interesting projects; they want a hand in the decision making without being sucked into endless meetings; and they want acknowledgement.
Basically, they want the opposite of Maslach's three facets of job burnout: depersonalization/cynicism, emotional exhaustion, and inefficacy.
I managed a great engineer who'd been in the business longer than me and had phenomenal tech chops. And in our 1:1s, he said he was content as long as the work was interesting, the meetings were short, and he heard "nice work" every once in a while. I assure you, he heard it much more frequently than every once in a while!