Well, it certainly didn't go where I wanted it. Last thing we need is a list of opinions on the merits of each. Yeah, it was intended to discuss the problems with people's eyesight and which system they should use to compensate for problems.
I know a LOT of people are going to try to take me to task over what I'm about to post below, but I can tell you most will be wrong.
Optics will not replace practice, and I don't care how much money you spend on the optic.
Some people really don't have good enough eyesight to get it done with irons, even with a lot of practice.
Yes, you can compensate for some vision problems by a LOT of practice, but you can compensate for some of them, or partially compensate for others.
You may think you can fool a red dot into precision work at long range, but you really can't. Of course, that also depends on the definitions used for "precision work" and "long range". Since much of this stuff is actually designed for military use, let's use military definitions there. Precision is head shots and long range is in excess of 500 yards. A red dot is known to the Army as a CCO (Close Combat Optic) generally intended for 200-300 yards max and body shots at that. They are fast usually, given some practice.
Precision work (groups under 1 MOA or head shots, or distance in excess of 500 yards) generally requires optics. Exception is made for high power competition, because their targets are adequately sized so they can use irons out to 1000 yards (and the good ones will mention practice is essential).
A lousy shooter with irons that goes to magnified optics may improve some, but it still won't turn him into an expert shooter. Dragging wood, poor breathing control, lack of NPOA, lack of proper position, poor trigger control are all still relevant and trump any optical gains. Some optics will handle bullet drop, but this is actually not essential (but nice to have). But, you still have to know how to use it, and that takes practice.
Then there's the whole wind doping and parallax compensation bit. Lots of people fall down here.
So, a lot of it boils down to using the right stuff, knowing how to use it (training), compensating for the environment (training and practice) and practicing enough to get all that into muscle memory.