I don't think this advice should be taken universally. If you are talking to HR and you left because things were bad, then yes pull out the corporate speak. But

I don't think this advice should be taken universally. If you are talking to HR and you left because things were bad, then yes pull out the corporate speak. But if you are talking to a manager or colleague who you have been on good terms with and you suddenly stonewall them you'll burn many more bridges than by giving your honest opinion.