Is Gargoyle Stoneplate the new GA for mages?

provides the dual resists GA used to give. It's active literally doubles your health if you're surrounded by three enemies and are about to be destroyed. But what really made me come to this conclusion, is that it reduces your damage done.

AD champions may not all be DPS based, but many of them are, and even those that aren't still have decent DPS with high damage auto attacks. So popping this is always going to reduce their damage, which isn't really a good thing.

But mages have cooldowns. After blowing your full rotation, that's it. So you don't care about doing less damage. All you care about is not dying. And when it ends, your cooldowns are up again!

They may have removed GA from the hands of mages... but I think Gargoyle Stoneplate could take it's place quite successfully.