Yeah 2016 was a very good team obviously. I'm talking more about the later 2018-2020 teams. Walks are good but some of those hitters had clear areas of weakness which were eventually exposed that they couldn't often adjust to which over time became easy for many opposing teams to gameplan for. Schwarber hard stuff up and in, Heyward pound him inside, Russell soft stuff away, Happ fastballs up out of the zone and breaking balls low out of the zone, Baez just don't throw him anything near the strike zone, KB sliders low and away.
Cubs still have a few guys like that (Morel on soft stuff low and away, similar with Swanson, plus Wisdom and Suzuki) but I think they've improved on it. We've seen guys make adjustments too, like Happ changing his approach since last year, Madrigal seemingly swinging harder and changing his launch angle since going down to AAA, Nico recently hitting balls with more lift.