Both rational and irrational thinking are just that: thinking. Thinking belongs to the conceptual mind. Both "right" and "wrong" concepts are still concepts, and thus limitations.
I think you have made a category error here. Just because rational and irrational thinking are both types of thinking, does not mean they are of equal value nor does it mean they are both limitations. Now if you say "All thinking is a limitation" well you had better stop thinking right away. But don't blame me when you find you can no longer make appointments, keep gas in the car, or find your next teaching session on a map.
Thinking never leads to enlightenment.
It is interesting that you think
that! Look, I have yet to hear of a single case of enlightenment that did not involve a substantial quantity of thought along the way. Also, I have never met any person of any degree of enlightenment whatsoever who did not continue to do a great deal of thinking. Some of them even write books. Try doing THAT without thinking.
Its opposite, when one learns neither to follow nor to reject them, their cessation opens up the mind for the experience of its very nature. The cessation of thinking and thoughts makes enlightened nature visible, not thinking.
Thoughts are what block the experience of enlightenment.
The cessation of thinking is not enlightenment. It's catatonia. Zombification. Had the Buddha done things this way, he would literally have had no thoughts and thus when questioned he would never had said anything. His head would have been literally empty. No lights on. Nobody home. Dead, even.
The same way, concepts are a limitation too. Concepts are just conventions, based on empty reflections of empty appearances of empty external phenomena. They can never lead to enlightenment. Only to empty intellectual "philosophies".
Well, I guess we can all burn our copies of Nagarjuna then. If ever there was an intellectual philosopher it was him.
It's not that you don't have a point. A busy mind is an impediment to meditation, but that doesn't mean we all need lobotomies. You've over generalized.