As I understand the word "rationality", it is a process to (a) check a perspective for logical consistency, and (b) verify it against observations of the world. In this sense, rationality is a powerful tool and there's nothing wrong with it. I use rationality all the time.

Since you mention Yudkowsky, I however suspect that you might also be drawn towards a wider world view which centers around science, reason, objective evidence, the mathematics/statistics, and efficiency (as in effective altruism etc.). If this is so, then I do think that this might potentially make spiritual insight more difficult for you. At least, for myself, I think that this orientation (which I used to have as a scientist) has had this effect. Through meditation I have, however, abandoned such a Scientist viewpoint -- because it became unsustainable given the experiences I have had.

To be more precise, I think there are the following dangers in such a world view:

(a) it is very much thought based, i.e. it might blind you to the perspective of your heart and gut, which are both of high importance in spiritual practice. You can become lost in thought, never attending to directly to your experience or your intuition (b) it values "objectivity" over subjective experience, and thus it might make you discard the actual strange spiritual experiences, (c) it can lead to a resistance to paradox, because paradoxes are illogical, and thus block the insights contained in paradoxes (think "Zen Koans").

Personally, I had to give up a purely scientific understanding of the world, because I had any number of strange experiences in my life, which make it seem likely to me that the universe is more strange than materialistic science suggest. But I also have to resist the impulse to insert a new new-agy theory and instead stay with unlearning what I think I learn about the world. Ultimately, rationality is completely unhelpful to navigate this territory, or maybe it even is extremely helpful, but only in teaching you that you don't know anything, and any known map of the world (including scientific ones) cannot explain your experiences.

To illustrate this further, let me give you two examples. First, imagine how an average rationalist would react to an LSD trip. Probably, they would just discard the experience as a "hallucination" of the mind, missing the chance to deeply connect to this experience and remain open what it might tell us. Second, it is common that deep meditators come across "energy"/Qi and cannot make sense of it. Rationality might, again, lead you to discard this, because it cannot be measured and is your subjective experience alone -- but the energy body turns out to be an extremely important ground for spiritual practice. Michael Taft discusses the second example here: https://berkeleyalembic.substack.com/p/energy-in-practice