What is too much, and why would such introspection be a bad thing if it consistently leads to improved mental states? But I think more importantly, “looking inward” is not really the primary focus, but a technique to help one realize what is (and is not) already there.
At one time I think I would have written a comment similar to yours, because I had not yet experienced the difference between the perspective-altering practice of “looking inward” through mindfulness and the lost-in-thought version, which looks a lot more like rumination and just experiencing the thought loop without perspective, which can be deeply painful.
These practices are full of paradox. This isn’t to say the practice is invalid, but to highlight the fact that such practice is not intuitive or obvious. Evolutionary psychology is helping us unpack the illusions that lead to such apparent paradox.
One such paradox being that looking inward through the practice of mindfulness is the thing that enables someone to look outward and actually see. Most people struggle to describe this in words, but it starts to emerge clearly with practice.
Put another way, the premise is that we are all so lost in thought by default that we don’t even realize we are thinking. To claim that we can see outward in this state is to remain unaware of the possibility space of what is available to see, and to remain controlled by thought. You’ll still “see”, but this seeing is distorted by evolutionary reward systems, and what you think you’re seeing is still suspect.
But seeing the truth about one’s own mind changes how one sees other people in deeply impactful ways.
For me personally, my internal anxiety and self talk was so dominant that it made some outward pursuits feel nearly impossible. Once my relationship with thoughts/feelings started to shift, it didn’t just help with the anxiety in the sense that it subsided, it fundamentally shifted my relationship with the concept of anxiety, and made it possible for me to examine it from a broader perspective instead of just experiencing and being swallowed by it.
You go from knowing that anxiety (etc.) is a feeling to experiencing that anxiety is a feeling, and one that appears alongside everything else in consciousness. The difference between these states is enormous.