To be clear, when I said:
@brass-man said in Becoming a better player:
mechanical playskill > mental hygeine > decklist > inducing your opponent to make mistakes > information management
I didn't mean that information management is irrelevant ... I just meant for most players, there are so many more important things to worry about that concentrating on hiding your deck is a wasted opportunity cost.
Can you get a few % points by an opponent misplaying because they think you're on a different deck? Sure. But all of those %'s go away if your opponent scouted the room. They go away in the top 8 when everyone knows SOMEBODY who has played against you in the swiss. They go away when your opponent isn't a regular and can't guess what you're on even if you always play the same deck. Most importantly, they go away in game 2, which is > 50% of the games you're going to play.
Nobody here is making so few mistakes that they'd get more mileage out of that .05% bump in 10% of games, rather than just playing the deck you don't make game-ending mistakes with. For certain, I don't come close to playing that well. I'm not the best player in this thread, but nobody here is playing at a zero-mistake level.
Does this mean you should never switch decks? Not at all. But there are other more important factors. Playing a matchup from the other side of the table can give you real insights on how to win, and if you're similarly strong with two decks, it can be correct to play something different as the metagame changes. I just don't think surprise value has a lot of weight here.
If you run into a situation where getting an information advantage is free? Awesome, go for it. ... but don't sacrifice something more important to get it ... and almost everything in magic, (like avoiding play mistakes or adapting to the local metage) is more important. Don't pitch your Ancestral to counter their Preordain.