[Mr Guy]

Well see that's the thing I'm having trouble figuring out how to phrase. It's not that they are WRONG so much as the situation just isn't so dire as they imply. You just need to be aware that the situation CAN arise, and account for it properly when you are in that situation, then you're alright. It's just not nearly so easy to wander into as they imply, because the error has to be larger than the depth of field, and as your depth of field shrinks, so does your viewing angle to a certain extent, and it becomes harder to recompose in such a way that your error is larger than your depth of field.

If you HAVE the option of using the correct AF, that's probably better, because it reduces the potential for error. I just think the general principle they should be taking away is not that recomposing sucks, it's that using extremely narrow depths of fields without caution sucks.