machineelf
Explorer
You are answering your own question as this paragraph progresses. Because your players can never know if/when your sensibilities will be tread upon and the stinkeye launched. They must walk on eggshells, constantly ready to have to defend themselves from accusations of being a filthy metagamer should they choose to take an action that fails your unwritten, or to use your own word "nuanced", smell test.
You keep framing my position as though my "sensibilities" are at odds with my players' preferences. They are not. I'm not sure why you concluded that. We agree on the nature of our role-playing experience and what we want out of it. And I am not always the DM. We are happy with how we play. And yes, if a person came into our group and started meta-gaming, it would rub all of us the wrong way. That's why it might be important for groups to talk about these kinds of things and their expectations before they get going.
You also seem to frame this as though this issue is unique to me and I'm the only one who has opinions on it. There is a long history of role-players who frown upon heavy meta-gaming. We are not a small minority.