Spawn point diving (fountain diving)

When I use Taric's ultimate and try to dive in the enemy spawn point (to kill them before they can heal up late game), I get killed. There needs to be a patch where you can spawn point dive and Taric's ultimate is immune to that for the couple seconds its active. The spawn turret should just do 1000 true damage per hit. Not insta kill. Even if you have a 7000hp Cho'gath, he should be able to take turret aggro for 7 hits. Imagine LCS, with the pros in late game, spawn point diving to get the quadra or penta, knowing they can do it if one of their tanks takes turret aggro. Just a thought.