Sure. But how about railings? How about odds and ends that have little -blam!-ed up angles like on Burning Shrine? Your statement about it isn't wrong in theory... But it certainly is much different in practice, where you [i]think[/i] the grenade will do something, and suddenly its aiming 90 degrees towards the floor due to some unseen small nook in the wall due to odd angles on the map.

Not only do I play Titan frequently, I've also witnessed lightning grenade strategy since vanilla. It's not too difficult. I'm not saying we need to nerf it I think it's fine.