Have you not heard of the spiritual ego? Most practitioners eventually grow a big ego around their practise. Chogyam Trungpas book “Cutting through spiritual materialism” is all about this
Now that you've mentioned it, I remember hearing about the term but I always took it as a possibility, especially when misapplying practice, and not a necessary part of the path. My own path so far seems to be confirming this notion of mine so the things you were saying piqued my curiosity to learn more.
Will I become more self-absorbed and grow feelings of superiority as I continue to meditate? I don't know. But I will still try and see for myself.
It's an obstacle on the path to surpass, it's just that most people do go through it to some degree. For some it's severe: my old teacher told me about a co-student who solved Mu and then became extremely arrogant and left the sangha saying he doesn't need them anymore. For some it's much more mild
Will I become more self-absorbed and grow feelings of superiority as I continue to meditate? I don't know. But I will still try and see for myself.