I can't know for sure why you were downvoted, but if I had to guess, it's because that answer just isn't very good. You happen to be the asker here, but that shouldn't be a factor in how you answer.
If this answer had been submitted by someone else, would it have been downvoted? Probably. Perhaps you yourself would have downvoted it. The answer is a single line. There is no explanation of why it may be a good idea. Why do we expect it to help? What happened when it was playtested? What are the possible shortcomings? Why are you asking another question in your answer?
I understand that you put the idea out there as an answer in order to get feedback. But that's not how the system is intended to work. We don't provide answers hoping for feedback. We provide answers because we think they answer the question. An answer is proposing a solution to a problem, and asking that viewers take the time to read it and consider it. That means that the burden is on the answerer, always, to justify and support their answer, and provide something worthy of being read.
To be clear: the solution (use a D8 house rule) may or may not be good. But the answer is definitely not great.
Maybe an example would help:
Q: How do I find the length of the hypotenuse of a triangle?
A1: Use Pythagoras' theorem.
A2: Guess.
Both of these answers are lousy. Neither has any real content. One happens to actually be a better solution than the other, but a naive reader cannot know that from the answer! A good answer would expand A1 to explain how, or why, or add a diagram, or work through an example case. It might also point out places where this solution would not apply ("if the triangle is not right-angled, options include...").
In the case of your question, since there is nothing substantive to the idea, you could legitimately have included it as part of the question, and someone could comment on its feasibility in their answer. Alternatively, you could remove the 'what do you think?' part, and expand your answer with some content.
