Its a three legged dog or a four headed monster.
Processing Speed, Arm Strength and Accuracy,
Fast processors have the most margin for error and can get by with lesser arm strength and lower accuracy ( Lesser not none)
If you are a little slower in the processing department, you can make up for it with greater arm strength and accuracy making up for lost time with increased ability to get into tight windows
The monster comes in when you add the fourth head running. Running hides the inability to process quickly enough, or lower arm strength or accuracy. A QB who makes his living running will have a short lived career as a starter with two exceptions
They can run while working on improving processing speed and throwing mechanics they have a two - three year window to get it worked out. aka Josh Allen
They can run once they have acceptable processing speed and accuracy , as a second option avoiding hits not as a primary means of play making. aka Deshaun Watson, Pat Mahomes
Guys who make the living playmaking with there feet and not their heads as QB's have careers with a short span of high productivity then tale off very quickly .
Mike Vick
Cam Newton
RG3
All spectacular phenomenal athletes with tremendous individual success for 3-5 years , then injuries start and teams hold out to long , they never recover.
Its fools gold to believe btw that if they are bigger, faster they can last longer, the guys on D are getting bigger and faster as well.
For AR to have a long career he needs to be on the Josh Allen path not the Cam Newton one