Discussion thread-Sharing EXP gives the full amount, not half.
What changes? Mages would go bot lane. In the early game mages destroy marksman, except for niche cases like X marksman being early game. The thing keeping them from going bot lane is the XP share is bad for them. They need XP to level up and get the base damages on their spells. Removing the halved XP on share would make a bot lane mage a lot more viable, as long as they can reliably kill marksman.