This question concerning the value about traditional lecture, which was posted by me a long time ago, was closed due to being too broad. However, recently the question was reopened and, judging from the downvotes, it is clear that the question is still not well-received. Would someone (maybe the person who reopened the question) care to explain the rationale behind reopening this old question?
I am the person who first nominated the question for re-opening. Questions typically should eventually progress toward either reopening or delation. I always did like the question (I am one of its up-votes), so I edited to try to make it more focused and neutral in tone, then reopened. Apparently enough others liked the question now to reopen it---though it seems to still be somewhat controversial, given the ongoing accumulation of up and down votes.
As the OP, of course, please feel free to further improve the question: I tried to preserve your intent as much as possible while decreasing the "rant" perception that helped cause it to be closed in the first place.
Down votes are not "wiped out" when a question is reopened.
In general, though, any question that had an answer can be reopened if it is edited, made to fit site guidelines, and enough "reopen" votes are cast.
I didn't vote to reopen the question, but members of the community (with enough rep) are allowed to vote to re-open it at any time. The ethos here is that questions are owned by the community, and the community are free to vote on closing and re-opening questions based upon their own view about whether it meets the standards for this site. Folks who believe the question is a good question might have decided to vote to re-open it, on the basis that they believe the question is on-topic and suitable and helpful. Hopefully that answers your question about why people might have voted to re-open the question.
Of course, re-opening the question also bumps it back to the front page, which might cause it to be read by new people who didn't read it previously. That can cause it to receive additional votes (whether upvotes or downvotes).
I suspect your secondary question is: why am I getting these downvotes, and how can I avoid getting more of them? I can share some thoughts on that.
First off, remember that upvotes increase your rep more than downvotes decrease it. It looks like you have received more upvotes than downvotes, so just to keep things in perspective, any loss of reputation due to the downvotes is outweighed by the increase due to upvotes.
Second, the best way to avoid downvotes is to edit your question to improve it based upon the feedback. The #1 piece of feedback you got is: "The rant/question ratio here is quite high.". As I read the question today, I still feel that this feedback remains pretty relevant. So, if you'd like to avoid future downvotes, arguably the best thing you can do is edit the question to address this feedback. You might try deleting some of the opinions (they can sometimes be perceived as "rant", even if that was not your intent), and focusing on the specific question. At the risk of exaggerating and over-simplifying a bit, consider the difference between "I see a phenomenom that puzzles me, I assume there are probably good reasons behind it, I want to learn, can you help me understand?" vs "I see a phenomenom that is stupid, look how stupid it is, why are universities being so stupid?"; you want to be as close to the former as possible, and avoid any opportunity for people to misconstrue the question as an instance of the latter. This is a matter of tone, and tone is always delicate, but it can affect how people view your question.
The other thing you can do in your question is to show your research. We expect you to do a significant amount of research before asking and to tell us about what research you've done. As explained here:
Have you thoroughly searched for an answer before asking your question? Sharing your research helps everyone. Tell us what you found and why it didn’t meet your needs. This demonstrates that you’ve taken the time to try to help yourself, it saves us from reiterating obvious answers, and above all, it helps you get a more specific and relevant answer! https://academia.stackexchange.com/help/how-to-ask
So, those are some concrete steps you can take that might avoid future downvotes, if that was part of what you were asking.