At the end of the day QB position is all about:
1.Accuracy
2. Pocket Presence
3. Anticipation
Arm Strength and Running are an extra boost
Alot of OCs have tailored plays to these running QBs strengths. I think Lamar Jackson and some other running QBs will always be inconsistent cuz they don't consistently do the 3 things above.
Also defense has adjusted to the new rules. Alot more nickel DBs, hybrid safetys and LB who can cover now