Thanks for the reminder - I just deleted my question that got closed by an admin and added a new one. If I counted on my fingers & toes properly, I think we're close to having enough questions & just votes on all the ones lower than 10.
Also, for what it's worth, over the past week or so I've removed some of my votes for questions that had plenty, and moved them to questions under 10 to help bump them up. Just so people know that's a thing that can be done.
Why delete an old question? There could be people, who are interested in the answer of that question.
Unless there is an "asking restriction" (=you cannot post new questions without deleting the answered ones), there is no real advantage of deleting old questions. But why would there be such restriction? It is pointless/meaningless.
The question I deleted was no longer able to be voted on (which didn't help towards the goal of moving on to the next phase), and I couldn't ask a new question without deleting, it as each person is limited to 5 questions each.
EDITED TO ADD: And the message I got from the admin who closed my question was: