Two mages intentionally weak to mobility
Anyone else a little confused by this? Sol is countered by your position, and Taliyah's only CC is in a small radius with a delay.
I'm all for balanced champions, but if they only way to balance a champion is to give them a crippling weakness to combat mobility (arguably one of the strongest aspects an opponent can have), there's something wrong with the design.
Perhaps Taliyah's knockup should be a 20~ units smaller, but targeted. That way mobile champions can still get away in order to prevent their allies being knocked up, but aren't completely immune to the ability.