But invariably, I reach a point in reading where the additional effort that it will take for me to read out the situation overcomes my care for responding "correctly". So I end up thinking, "Meh, I'll just play here". Based on my feeling, maybe this results in a situation like this:

The "Don't care threshold" comes into play when the amount of effort exceeds my care about the result of the move. Throughout the game, this threshold changes, depending on how much I care about the result of that move and/or how difficult it is to read out a position.
But all of the time, I feel that this threshold comes into play. It's not that I couldn't read more - I just don't, because I don't care about that move enough to bother.
Has anyone else encountered this mentality? Any thoughts? I feel that this attitude is quite limiting to my play.