If you develop the habit of keeping promises, then there is less friction, because you do what you say you'll do.

Willfully breaking promises undermines your ability to keep promises.

This in turn undermines your ability to execute ideas.

In order to preserve your execution, you may develop conceptual elaborations (rationalization, justification).

This is expensive -- it takes mental effort -- it's even in the word: elaboration.

You develop the habit of acting according to your private caveats & justifications, rather than your word.

: : : :

That all might be ok if you're in the business of trying to find the perfect reference point by which to order your behavior

It's rubbish if you're Buddhist, because there is no eternal, unchanging reference point.

What this means is, hypocrisy is a losing game -- your self-justification will collapse under increasing complexity and you'll end up discarding it anyway.