That's not what I said. See heavydriver's post. The point was the reason of "don't want to instruct" simply isn't valid for a career that essentially requires you to instruct. I didn't say whether or not it would make you a good airline pilot. If one chooses to be an FO their entire career they could be a fine pilot, but that's generally not the way it usually works and people usually have aspirations of eventually getting to the right seat. Whether or not they start instructing sooner or later may be a little more debatable or arguable, I'm not saying someone needs to have an CFI to become an ATP at all, but if one thinks they are not going to have to teach as an airline pilot, they need to sit down and research more about their chosen career path.