Part of how the meta shifts is “people who lose on defense adjust their team”. If they could see the secret sauce teams that separate the top-tier players from the lesser players, they could better adjust their defense teams.
So I support this, and think top-tier players should too, because it means they will more frequently have to face the challenge of adjusting their teams. In many, many other games, it is impossible to play an opponent without revealing your team. Even professionally-played games such as Magic: the Gathering. Full decklists are available at the end of every tournament. People adopt those decks. Smarter people tweak them. Even smarter people build the counters. That’s how a healthy meta is built.
I think a problem in GoW is we don’t quite have enough depth of mechanics to realize that reality.
I don’t disagree that the higher-end players deserve mad respect for the brewing they do. But I disagree about whether letting them keep that secret supports a healthy game. Netdeckers will netdeck, but in a decent game they should generally be a step behind the people who are winning.