Ah, yes. I think I have made use of that a few times - I think it works when you are on the screen for entering a question as well. I do know that if you start typing in the box for tags, the suggested tags adapt to what you are typing, so that you can choose an existing form of what you have in mind (if there is one).
I suppose the five sample questions also adapt to the tags you choose, although I don't remember for sure.
It is not so strange that the five suggestions for just the "question in one sentence" are not always so relevant, since very different questions may be framed in the same way.