Tower Buff: the Anti-Tower Dive Spartan Laser

This could be a terrible idea but I will share it for funsies.

Imagine turrets had a passive ability that if a friendly target is within reasonable range of the turret and an enemy player attacks them within turret range and take aggro, the turret will start charging up a devastating attack that after a 4 second channel will blast the enemy and nuke their health. After the blast, the ability would go on cooldown. People are always complaining about towers being too weak and laners being too susceptible to tower dives, so this would give defenders a 4 second window to survive the dive before the aggro-taker is blasted to smithereens.