cogent vs what you see is what you get

cogent

adj
  • Appealing to the intellect or powers of reasoning. 

  • Forcefully persuasive; relevant, pertinent. 

  • Reasonable and convincing; based on evidence. 

what you see is what you get

proverb
  • The image corresponds to the reality. 

  • The screen image resembles the printed output. 

How often have the words cogent and what you see is what you get occurred in a corpus of books? (source: Google Ngram Viewer )