There is a cognitive bias called "loyalty to the brand", in which it says that people prefer the things they have because they rationalize their choices to protect their sense of ego. When they invest time (or a lot of money) to something, they create an emotional connection, especially if that was a choice and not something imposed on it. It is choosing one thing about the other that leads to narratives about why you have done a certain thing, something that is usually connected to your self-image.
There are a number of cognitive trends that converge to create this behavior. This assignment effect appears when you feel that the things you have are superior to things you don't have. Another bias is the fallacy of irrecoverable costs. This happens when you spend time or money on something you don't want to have or don't want to do, but you can't avoid. For example, imagine that you spent time studying Rust. You will be "hooked" on the idea that given the time spent in this, it is better to defend the language, even if you imagine that it is not for all things.
To combat post-decisional dissonance, the feeling that you committed to one option when the other option could have been better, you strive to feel justified as to what you selected to reduce the anxiety created when questioning himself. All this forms a gigantic group of neurological associations, emotions, details of self-image and trends around the things you have.