So when you say "it isn't just about how often the QBs throw deep, but rather also how effective they are when they do it," by "how effective they are," you only mean completion percentage and NOT passer rating, right? Because that's the only measure of effectiveness that you used in your post. As if yards, touchdowns and interceptions are meaningless.
Yes, you gave an "entire breakdown" of seven passes by Romo and six passes by Dak on throws of 41 yards or more, mentioning only completion percentage. And an "entire breakdown" of 25 passes by Romo and 22 passes by Dak on throws of 21-30 yards, mentioning only completion percentage.
Oh, and you CONVENIENTLY skipped over the passes in between -- you know, those 18 passes by Romo that went 31-40 yards and those 10 passes by Dak that went 31-40 yards. Was it because Dak completed 40 percent and Romo completed 22 percent? Nah, that couldn't be it.
You want a larger sample size? How about Dak's ENTIRE CAREER on passes thrown 21 yards downfield or more? He has a passer rating of 112.0 -- is that effective enough for you?
We can take any sample size you want from Romo's career for comparison. Over his ENTIRE CAREER, he had a passer rating of 101.2 on passes 21 yards downfield or more. If we just look at his peak -- the four years from 2011 to 2014 -- he had a 104.3 passer rating on throws 21 yards downfield or more. If we cherry pick just his two best seasons, 2011 and 2014, his rating on passes 21 yards or more goes up to 110.9. That's tremendous, but it's STILL below Dak's 112.0 in the only two seasons of his career.
None of this means that Dak is somehow better than Romo or even that he is even in Romo's class yet. What it does mean is that anyone who thinks Dak hasn't been effective when he throws deep clearly has not been paying attention.