Vague Language in the Time of COVID

All the hoo-ha about Boris Johnson’s speech on Sunday got me thinking about the various reasons people use vague language.

Do we do it without realising or is it more likely to be intentional? Is it always a bad thing or are there ever good reasons to be vague? I’ve identified 10 possible motives in this short video, which also doubles as a short quiz. What other ones can you think of?