Peyton Manning says teams fail young QBs when forcing them to change coaches, systems

LOL I knew this would bring out of the woodwork. Of course it's better for a young QB to be in 1 system for 5-8 yrs 1 OC . But Dungy's NFL is not today's NFL . Unless the HC is a offensive HC calling plays and is not going anywhere it does not happen because GMs are looking for the next bright young OC to be a HC. It was easy for Dungy to keep Tom Moore all those yrs . In today's NFL Moore would have been a HC after 2-3 yrs as the Colts OC
I can agree with this 100%. This is why we have better coordinators than actual quarterbacks and why we look for athletes than can throw. What you described coincides with the decline of actual quarterbacking in the NFL (along with the lack of development in college).

It's not like one offensive system is spoken in English and a different system is spoken in Japanese. There are a lot of similarities. It's not like the QB is asked to lean to speak Dolphin . But in any system the longer you have the same thing going on the easier it is to master, IF and I did say IF the QB is capable of it
Different QBs have different skillsets which does not fit every offense and this doesn't translate across the board. Not to mention the fact that we never take into account what these QBs are required to do in each system. Lamar Jackson and Josh Allen being asked to play in a pure progression, traditional pocket passing offense would be ugly..lol. Fit matters and always have...

With the emergence of QBs like Mahomes , Allen , Jackson and Daniels that have that off scrip element which system they run is somewhat diminished
What if I told you that a lot of the "off script" element comes from these quarterbacks missing reads all over the field..lol. The irony of this is....
One thing for sure is that the Shanny/McVay system is the easiest on a QB especially a young QB and seems to get more production out of a less than elite QB
the offenses that Mahomes, Allen, Jackson, and Daniels run could be said to be the easiest....