Tracking enemy xp?

Notably, it'd tip people off about ganks waiting in the bush, as someone who is 'solo' would be sharing the xp with the jg (or whoever) trying to set a trap.

At early levels you can keep track yourself though (at high level of play everyone knows pretty exactly when their lane opponent is going to hit 2 barring crazy level 1 invade shenanigans), and I feel like dives where you can't survive long enough to pull out 1 more aa to mitigate the level up heal were probably ill advised to begin with.