Garland,
I think you are probably unusual in hitting more balls into trouble with a shorter club than a longer one (or have identified a need to work more on your short iron play)
Jason,
Hitting a shorter club off the tee is actually a much harder decision to make than it used to be. 10 years ago I probably hit 1 iron off the tee at least half the time on driving holes, even on some par 5s where it was not reachable or the odds were long. Most people don't (or never did) carry a 1 iron but you can substitute your favorite fairway wood or hybrid where I say 1 iron, its the same concept of having a go-to non-driver club you feel confident in off the tee.
Now that a driver is the easiest club in the bag to hit, its a lot harder to make that argument to myself. I know Shivas at least feels the same way, we've discussed there before in multiple threads in the past. It used to be that the difference in distance between my driver and 1 iron wasn't all that great, and the chances of a mishit were roughly equal. But the 1 iron was a bit shorter club, had more loft than a driver so there was less undesired curvature on the ball, and I had a bit more control of trajectory with the 1 iron than I did with the driver (that had one trajectory for me, high, even though I was using 6.5 to 7 degree drivers back then)
Since then equipment changes have made drivers that are much larger to where it is the easiest club in the bag to make decent contact with, increased driving distance so the distance gap between driver and 1 iron is a lot bigger than it used to be, and produce less undesired curvature on the ball. The only thing a 1 iron has going for it now is that it is a shorter club and I'm confident in it, but I mainly use it off the tee now to stay short of trouble rather than believing I can hit it straighter in its own right (unless its one of those days where I just feel like I have no idea where my driver is going)
If I dropped all the way down to a 210 yard shot as you suggest then for most holes over 400 yards I'm leaving myself one hell of a long approach. If my layup leaves me with an approach where I'm probably going to end up with a bogey (or worse, feel like I might as well layup again instead of trying for the green) then unless there's very severe penalty of the stroke and distance type awaiting a badly directed driver, what have I got to lose by hitting the driver? If I hit it well I've got an easy shot to the green, if I don't I can hack my way sideways out of trouble or whatever and then have an easy shot to the green. The average score I'd achieve with the driver is probably better, even if the variation might be larger (and golf is more fun, albeit frustrating, when played with a higher standard deviation of scoring
)