Yes, exactly. I though about it. Lets imagine I have an incomplete silver CA deck in conjunction with my max Reb deck. I will fight in silver against dumb bots and quickly move up to gold. In gold I will find other silver decks in the same situation but I will also find some gold and diamond decks that are just bad players.
True, I will have a 50% win rate but I will win against the bad or underleveled players while losing to the overleveled ones. Honestly for that I rather just let the bot play. It sounds extremely boring.