I think it makes voting too complicated, and would not be a useful feature for the majority of Steemit users. The majority of Steemit users now are probably unaware that voting weight is selectable in the steemd backend.

For those not in the slack this is part of an ongoing discussion on UI changes to allow selectable voting weight. For now, this is only a concern for the handful of people with 'whale' accounts. If the UI is changed to allow selective voting weight, I'd like to see it be an "Advanced voting" option setting, on a yet-to-exist Steem Settings page.