Wouldn't hurt? I would predict a forum response of: "Raaar! Focus on pew-pew again! SMASH puny explanation!", based on what's already been said...
I think the opposite. It's worse to say, "FF for mining cancelled until further notice" without explanation than to say "It's been overwhelming with the responses we got, so we're just pushing it back a week."
Besides, 90% of the things added to Elite is pew-pew. Explorers and miners are eagerly waiting for some new tech and expanded features, and perhaps even make mining a profitable business again.
And there are certainly types of delays where Frontier absolutely couldn't tell us the details - e.g. the developer who does mining has just been signed off work with a medium-term health condition. In that case there's no technical or process reason behind the delay but it would be an illegally-bad breach of confidentiality to reveal anything about the actual cause, especially on a public forum. So all they can do in that sort of case is say "delayed, more news later".
True.
But leaving it open, now another explanation could be "We have to hold off on mining FF because the guys who were supposed to work on it had to step in on the JW project and we don't know when they can be freed up again."
Sometimes, it could benefit to even confabulate a little like saying "we're overwhelmed with the responses" instead of "we care more about this other projects so you guys have to wait." Now, it's all up to speculation.