Yes, obviously an 8i from 8i distance will get you closer to and/or on the green vs a 5i from 5i distance. But the tee shot is part of this equation too. And the point is that you're a bit more likely to get to 5i distance with a 5i (*and* have a shot at the green *and* not be OB or otherwise in trouble) than you are likely to similarly get to 8i distance with a driver. I'm just saying you need to consider the tradeoffs.
Again, that's obvious. The point is that 2 poorly hit 5i will likely leave you in better shape than an equally poorly hit driver followed by an equally poorly hit anything.
I agree with the 5i versus 8i distances, but drivers are built so well these days it's really hard to not get at least 150 yards of playable distance with it. A 5 i on the other hand is difficult to get 150 yards of playable distance for a beginner.
The fact that a driver is sitting on the tee box makes it easier to hit.
I was a high handicap less than 1.5 years ago, and the strategy that worked best for me was to hit driver then a 3W or 5W to get 350 yard par 4 distances (yes, that's no typo). A beginner is more apt to be able to hit a wood and hybrid because they can be swung more upright and get a decent result. I always liked the tee box because it is more controlled, panic set in on rough and even fairways.
Irons are simply harder for beginners to hit properly.