In the academic and literary circles, such as some university teachers and professors, these people have rich theoretical knowledge, but their practical ability is relatively weak. In addition, they are too theoretical and often have some individualistic ideas.
I once thought that I could learn Feng Shui. A gentleman who looked at the cemetery wanted to take me as an apprentice, but after weighing it again and again, he didn't agree. Perhaps he is very practical, but without theory as the basis, it is impossible to blindly inherit the ideas of the previous generation.
If you want to do it right, you must combine the two.