Okay, so there are many rational reasons for this, but there is one major one that sticks out.

He spoke a very persuasively but I smelled a rat and refused his offer.

I know people who are like walking dictionaries - they know the most obscure words in the foreign language and can explain precisely how the grammar works.

And it was a long apprenticeship, learning to tell stories.

Say well is good, but do well is better.