My (direct) answer was label engineering. Why? Because the distance between "why am I building this model?" and "what labels do I need?" is generally small.https://twitter.com/seanjtaylor/status/1066423411910438912 …
Yea. And, at least for me personally, it's very easy to get hopelessly lost in the pleasant puzzle aspects of problem solving. Anything that stochastically nudges me back in the right direction is useful.