Why do we have this?

Why, despite having little support, the need theories of motivation continue in the textbooks?

Clever (or dumb?) Phrases

I often come across phrases that do not make sense to me. At times, the sense they make is ephemeral, and subsequently confusing. I am jotting down two of them:

1. on the margin

2. point of departure

I feel like accusing that some clever people started using them, just to look more profound or to confuse people.

Rajiv