I've got more into grey thinking over time. I remember being horrified when a teacher gave us a lesson to show us all that a lot of questions don't have simple yes-or-no answers....it just seemed that it would make life a lot more complicated. But I gradually got used to it.
Another pointer showed itself early in my science career. The guy I was working with was designing an experiment that we hoped would answer a question (that's what experiments are for, of course)....then he said that in the past his experiments had usually not given clear-cut answers.
I found out that chemical reactions NEVER proceed to absolute completion.......we'd been studying equilibrium reactions which always leave a significant proportion of reactants in their original state, and they then told us that the same was true of all reactions, only for most of them the unreacted stuff was a negligibly small proportion of the whole.
Then I studied Zen Buddhism and found out about a notion that for every true assertion, the converse was also likely to have truth in it.
By the time I discovered AS, I was already well on the way to habitually correcting my black-and-white thinking. I still regularly fall into the trap, but whenever my thinking fails to lead me to whatever it is I'm looking for, one of the first questions I ask myself while scrutinising my thoughts is, have I gone and overlooked a grey area again?