i dont get it
You've obviously never been on the receiving end of an AP Nunu snowball.
Think trying to flash to avoid the damage of an Annie Q, only your death isn't instant.
No first you wait in terror of whether you'll get hit and the cringe at the missing third of your health bar once it does.
Then you have the coming dread that you basically have just been marked with death as you now have little to no speed to escape even with a flash or ghost. Because Nunu will also have sped up an ally nearby and will now be chasing you down under your own tower.
But with the gif above? you simply throw your snowball at people to poke and walk away as they "explode" from the damage.