I mean, Sports Illustrated seemed to agree that quote is admitting he couldn’t read defenses outside - according to him - of some coverages, so it wasn’t just me that interpreted his comments that way. It’s literally in the headline they used to describe his comments (yes, I did read the article at the time, and it’s how I interpreted his comments).
Your point about Shanahan offenses is exactly the point I’m making: everything is schemed from the sideline with little seemingly adjusted pre-snap anymore based on how the defense lines up. Also, I wasn’t just talking about running quarterbacks, I was talking about guys (and teams as a whole) that rely heavily on elite athleticism, which Mahomes has and has been a human highlight reel for years.
I understand your point, I think you’re just splitting hairs over what you interpret as “reading defenses” versus what I interpret it as (pre-snap blocking adjustments, blitz pickup, Mikes, audibles when mismatches are identified, quick releases). I mean, even Mac Jones and Zack Wilson, as terrible as they are, can identify a zone, man, nickle, - most basic defensive alignments. But I rarely see them or any other younger NFL QB making “correct” pre-snap adjustments the way we saw guys doing it 10 years ago.
To my eye, it’s because most modern quarterbacks struggle with defenses that play disguised and rotational coverages. Many of today’s QBs don’t pick it up pre-snap and react accordingly after the snap (usually with elite athleticism, or in Mac’s case, panic and turnovers). In a way I don’t blame them, I think it’s a coaching issue. I described it as “helicopter coaching” earlier, which is the best way I can think of to describe it. McDaniels did it year 1 with Mac, then when Mac was left to read defenses and make pre-snap adjustments on his own, the wheels came off. But he’s not alone.
In fact, I genuinely could not tell you who’s regularly recognizing these types of coverages and assignments pre-snap and making the correct adjustments in 2023. Russell Wilson probably? Dak Prescott? Rodgers of course when he’s on the field. After that - no idea. Just watch any game with guys drafted in the last ~5, 6, 7 years, look for this specifically, and you’ll see what I’m talking about.