Doom lost nothing in Doomwar. Absolutely nothing. Namor lost everything first and nearly died (caused by Wakanda, BP, BB and himself), Thanos' Cabal lost the first time and were trapped/killed. Black Swan wouldn't have been trapped in the first place without T'Challa. That's a clear difference.
I'm annoyed by how Wakanda was handled (despite knowing it was going to happen since FF), but lets not front, Panther has done way more than he did in Doomwar. Yeah, the backfires have been vicious, but again, we'll see if part 3 of Bast prophecy overshadows those or not.