The problem we're currently seeing in top lane is also a mid lane problem

Soraka are currently being taken to top lane, because of the lane's inability to influence other lanes, and games often being decided before they're in a position to rotate.

This exact problem also occurs with traditional casters in mid lane, with very few exceptions (i.e. Cassiopeia), and it's assassins crowding them out rather than supports: you can only take assassins to mid lane in solo queue and expect to consistently win, full stop.

Traditional casters cannot reliably impact other lanes. If they get caught by a jungle or assassin while navigating to the other lanes, they're dead.

They also provide their opponents with too much counterplay: a Vel'koz can 'catch' his opponent in a bad position where his combo is otherwise unavoidable, but if they Flash it, Vel'koz is now completely fucked. Compare this to assassins who are largely point-and-click. The reliability is not there.

If anything, we need changes to normalize agency over the game across all roles and lanes.