It baffles me why such a simple point gets so twisted.
Of those few you mentioned, how many more...4 times more...didn't make it.
You basically have a 1 in 4 chance of even getting a good quality NFL QB by choosing one in round 1 let alone a Superbowl QB. And BTW, Trent Dilfer???!!
This is over the past 13 years according to the author. That's a pretty respectable sample size.
There are other ways of getting a really good QB that doesn't involve throwing darts at a board. You can go after 1 in FA or trade just like the Rams did. Sure, that can be hard to do. But one of the ways you do it is to have a very desirable situation, with a good owner, GM and HC.
And yes, the other point is there is little other way to get a QB than to get one in the draft. But, that's also why so many drafting mistakes will be made. For one thing, if there is a can't miss prospect (and how many of those guys have flatlined) and you have the 1st pick, you're not giving it up no matter the offer. But, man, you gotta be bad to get there. And even then, the odds are against you.
So, for a team like the Rams, go ahead and draft a QB in the 3rd, 4th round, even 5th every year and keep going because the more darts you throw, the better chance you'll have. And do it while you still have a really good QB. But do NOT use your 1st round pick on one. Unless you don't value it.