Every time they tell us that it's tricky to fix etc, I get the feeling that they're still trying to fix each animation separately, instead of reverting everything back to what it was before the addition of eyelashes, and after that make it so that the eyelashes fit the eyes instead. By trying to fix each animation separately they're just digging a deeper hole.
As I wrote in this thread, on the 16th of September, the issue isn't just about sims not closing their eyes properly, the issue is that all eye animations are affected because of the changes that were made to the eyes when they added eyelashes. My take is that the only way for them to fix it properly is to revert it back.