If you were to ask someone why body/soul cultivators are quite rare to see, besides the fact that humans naturally fear the unknown, which reflects in how many people give up in the soul path after getting to know that no one has gone past the Transcending realms, the other reason is that cultivating the body requires movement.
For animals moving is a natural instinct, the body path which enhances instincts is the same, that's why body cultivators are quite energetic, then we the we have soul cultivators whose focus is meditating, reflexing and comprehending the complexities of the soul.
That doesn't mean they are all smart philosophers or scholars, since everyone's personality which is linked to the soul is different, soul cultivators are the ones with the biggest variety in their files, from calm to hyperactive and eccentric or even crazy guys.