'Suggestion' would be an understatement. Additionally, it is that no rookie quarterback-led team has competed in (e.g. runner-ups) and/or won (e.g. winning) 34 pre-Super Bowl era NFL championships and 6 AFL championships along with 53 Super Bowls.
I will not argue fairness but I would accurately emphasize that particular circumstance neither applies to any rookie quarterback-led team in NFL playoff history nor the 2016 Dallas Cowboys team.
There is no denying the rarity of the circumstance. It is also undeniable the circumstance surrounding the 2016 season ran counter to the possibility of the 2016 team either appearing in Super Bowl LI or winning it from the historical perspective.
History has some measure of relevancy in all things in life. Sports is not an exception.
I’m not denying there is value in looking at history, but you also have to understanding what you are looking at rather than making the easy, face value assumption. Looking at history means nothing if you only look at the end result and have no knowledge of the causes and circumstances that led to it.
Here are facts that give a more in depth view...
1. In any given year there may only be 1-3 starting QBs that are rookies, so that factor alone limits rookies to a 3-9% chance, and has nothing to do with the ability to handle the job and win as a rookie.
2. Of those 1-3 rookies that do start in a given year, most are on bad teams. Most of the time rookie QBs that start are top draft picks, and usually the team that picked them had a top draft pick because they were a bad team the year before. So that further limits the odds based on something that has nothing to do with the rookie QBs ability to handle winning.
3. In the earlier Super Bowl year’s (60,s, 70’s and even into the 80’s) even the best rookie QB often didn’t get a chance to play because it was common practice for QBs to sit a few years and learn before starting. So, again, a further limiting factor that has nothing to do with whether the rookie QB can handle the job and win.
So what does that leave? Maybe only a 1-2% chance of a rookie winning the Super Bowl based on things that are about lack of opportunity and not lack of ability as a rookie.
Dak ended up in a fortunate situation that bucked a lot of those odds, injuries to 2 QBs allowed him, as a 4th round pick, to step into a good situation as a rookie - a situation very few rookie QBs ever get. And he performed well given that rare chance.