[Teemo]

Why nerf Pyro and Tesla but not Holy Stun / Water Whip and Beams?

This doesn't fix the issue at all, people are going to do the same shit with different spells. Nerf them all

Specifically Pyroclasm is surrounded by highly attractive combo options as a Basic Spell, although the 'lesser evils' will be addressed if they are truly overpowered. 

So far this has not been the case. Water Whip is a 20 spell point investment if you intend to only dip, and Sanctify is an intermediate ability. Might change in the future though, just easier to start with the obvious imbalance.

All three of these trees have highly attractive combo options. Ether has Lightspeed, two beams, and a billion follows up for those beams. Water is similar without the Lightspeed.

The obvious imbalance is that all of them are imbalanced