"Hey guys we can't nerf lee sin because of community backlash"
one veigar nerf later
community responds with massive backlash on boards and reddit
"sorry guys, but these changes are LOCKED. This is only way to make veigar a healthy and balanced champion"
stuns were shutting down flashy plays of
and
. In the interests of making THEIR play more fun, Riot decided it was better for the health of the Streamers - I mean game - to make playing against 
meaning Veigar won't have mana problems for a large portion of the game, and doesn't have a reason to use mana early other than to Q and protect himself.