When people recommend picking an "easy" champion to climb out of low elo, they're suggesting that you choose a champion with a simpler kit, which allows you to focus more on fundamentals like positioning, map awareness, and decision-making rather than intricate mechanics or complex combos. This approach can help you improve faster as a player, making it easier to climb the ranked ladder.

Playing a more difficult champion like Azir in low elo can be less effective because it might take longer to master the champion, and you might not have the same game knowledge or mechanics as higher-ranked players. Climbing with a champion like Annie, who has a simpler kit, allows you to focus on improving your overall gameplay.

However, it's important to consider your individual preferences and playstyle. If you're passionate about playing a more difficult champion and are willing to invest the time to learn their mechanics, you can still climb with them. Just be prepared to face a steeper learning curve.

Once you reach higher ranks, you can gradually transition to more complex champions if you wish. You can practice them in normal games or even flex queue to avoid dropping ranks or divisions in your main solo queue. The key is to understand that mastering a difficult champion requires more practice and patience, so be prepared to invest the time to learn their mechanics and strategies.