The whole thought process to have this feature at the moment is to award players who are last three picks to have the opportunity to ban one champion each since they are lower priority in that particular champion selection. That made sence only with the previous queue type. With new Dynamic Queue the rolls are predetermined, so being last three picks doesn't matter at all, and is actually a good thing now, listen up now! What we should be compensating are the first three picks, as they have more opportunities to get countered, hence have the opportunity to (maybe) ban a specific champion they find the hardest to play against. Thoughts?
P.S. If being higher pick means you can get someone's champion who's lower pick, that is a low percentage case since there are only a few flex picks (and Solo Queue people certainly don't think about that and swap around as it's hard to agree for, plus not many players have a lot of champions available).