"Stack Overflow has reams of bad advice for Objective C. The dominant suggestions (that I encounter, anyway) routinely come up at the next-year's WWDC as things

"Stack Overflow has reams of bad advice for Objective C. The dominant suggestions (that I encounter, anyway) routinely come up at the next-year's WWDC as things you should not ever do for any reason (and then they continue to be the dominant suggestion for another year)." Can you provide some examples of this?