If the goal is to post your lowest score and one is very inconsistent with the diver (almost never on fairway, lots of OOB and penalties) it makes sense to leave it at home or in the bag. The question is what level of consistency warrants hitting driver if the goal is shooting the lowest score.
If I hit 7i off the tee on every hole I am making it almost impossible to shoot less than bogey / double bogey on every hole except Par 3's so you have to consider the risk reward of leaving the driver in the bag. Also some people hit their driver better at the range than on the course and for those people gaining confidence with it on the course is a way to overcome the mental part of it.
I'm not trying to make a comment on whether or not you should hit driver or 7 iron. It doesn't matter. It doesn't matter if you make the wrong choice.
My comment was aimed at people who have the attitude that their "working on their game" or "getting comfortable" out on the course, so they hit driver b/c they want to learn how to do it. I think that's a pretty good way to stay a high handicapper forever. Trying and focusing to hit the correct shot (not necessarily driver or any particular club) for every shot is a skill that must be practiced. I'm making a point bigger than "driver or 7 iron?".
Exactly. And this is something all players need to do on their own. I was commenting on the few posters' whose answer to this question was "what the heck, I need to learn driver eventually, so I hit it on the course". To me, that's silly and hurts your game in the long run. Its not important if you get the right answer. Its important to get used to asking the questions on a golf course, during a round.
Taking the attitude of "its not competitive anyways" every time you tee it up is a pretty good way to insure that when it *is* competitive (or you want to shoot low, for whatever reason) you get freaked out and choke. You need to practice trying to shoot the lowest score possible. Its very important to getting better IMO.