A downvote pool is not a UI issue. It is a blockchain issue, currently to downvote a post it cost the downvoter mana, it does not matter what UI they are using. If it was a UI issue then people using busy or esteem or another UI could downvote at will if their UI did not charge a mana fee so to speak for downvotes.
(part of the EIP is also to reduce the cost of downvotes).
There is two sides to the downvote issue if not more. At what point does needless downvoting stop? Enabling a cheaper downvote is enabling bad actors. By lowering the cost of downvoting that does nothing to curb downvote abuse as is currently happening. The vast majority of downvotes appear to be going out to comments not plagiarism, not excessive reward, but to normal everyday comments.
People talk about wanting to stop the self vote and self vote from alt accounts, start with the first issue, the self vote. Do away with it. Then see if people continue to vote themselves with alt accounts. People will see a trend pretty quickly, then the downvote for reward abuse will work.
By eventually allowing people to get paid or to pay themselves because of their downvote actions is only going to exacerbate the issue. Because getting a downvote curation reward is where this is all heading, that is pretty obvious with the desire to have a separated downvote pool.
For the last 22 months on steemit, every time the self vote is bought up, it has never been simply stopped, removed from the system. Either it is good for the blockchain, or it is bad for the blockchain. Before creating new problems fix the problem everyone keeps saying is the reason for the downvote pool and that is to stop the abusive self voters. Just do away with the self vote and be done with it.