That’s not killing half the voting system to solve half of the vote manipulation. Downvotes do not even get used at the same ratio as upvotes. I’m sure someone can pull numbers, but I’d roughly estimate that in most communities no more than 10% of votes are downvotes. And even if they were, I’m not sure you quite parsed my full comment.

• I stated very early that I don’t specifically like disabling downvotes.
• I stated why I think that post-hoc remediations will not work.
• I proposed a potential compromise which can be used to mitigate abuse without a blanket downvote ban.

Blocking voting on fresh accounts is not a novel idea. As another commenter said, it’s the system used on Stack Overflow. Blocking all downvotes is not even the goal. The goal is to make brigading not worth the effort. The worst case scenario is that all downvotes get disabled (which still works, despite its unpopularity - it’s been implemented by instances like beehaw). But in the end, that’s just a baseline. It can be improved, and I like to believe that I was quite clear on that in my first comment.