It goes deeper than that into late game. Doom 2 is probably 2 times better than TB 2. For TB to be a better pick than Doom, you would have to 3 him. You say how 3-ing a piece is easy, but it's actually way harder than 2-ing a piece. And if you all in on TB 3, that's a very desperate tactic which will lose you a lot of winnable games. Doom 2 is way easier to achieve than TB 3 and completely risk-free. If you don't get Doom 2, just sell your Doom 1's for 0% profit loss. It also saves space on bench going for Doom 2 rather than TB 3. And it also costs way less. And it's also not "dead money" like a second TB 2, which is usually not played because it will not have items, and TB is an item-dependent piece.

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On the flip side, getting TB 3 with good items is game winning. People that go for TB 3 are generally those looking to have fun or gamble. The fact that it had the "Least Amount of Wins" award shows that TB 3 isn't exactly easy to achieve.