@ten-ten I see people crack fetches EOT thinking that "duh, thinning" is actually a thing. Then they waste card advantage by drawing Brainstorm, Ponder or similar effects.
To further expand on cracking fetches at the right time, people should also be extremely mindful about when they crack fetches. Remember that if you crack a fetch you do not have access to that mana till you fetch your land, which might allow your opponent to respond to the fetch activation!
True, mana drain is played a bit less these days, but it's worth keeping in mind that you don't want to drop your shields by fetching at the wrong time.