Serious question: to what end? I'm pretty adept at skimming text and honing in on things of interest. I have also spent years in academic and professional environments developing those skills, so I genuinely may not understand some common use cases.

I can see this if you're looking over something and don't know what it is. Highlight it and right-click or whatever and ask the AI to give you a quick summary. Similar to how wikipedia links will show enough in the preview to get an idea what it might be.

In a typical corporate environment, you cannot assume the recipient of an email will read past the first sentence, maybe not even the subject line. A vast number of people simply do not read. They can but they don’t.