"You can make the utilitarian argument for 'fun' in a lot of ways - but non-serious items, at their core, always come with a negative fun cost for existing strictly by the nature of their non-viability. If not for the person using it, then for your teammates that suffer when you choose to build a joke item." -Xypherous
The only reason Tiamat doesn't work nearly as well is because of Twitch's massive nerf.
Before, Tiamat was absolutely insane on him, and thanks to it, he was an amazing hypercarry.
Now, picking Twitch at all (along with two dozen other champions) is more toxic and "non-serious" (in that you pick him for fun, not to win) than Tiamat could ever be.
I'd like to know what Riot's definition of "viable" is, because I'll probably laugh, and everyone could use a good laugh.
No hostility intended.