You are totally ignoring what Smith can do at the LOS and the impact it has on the end result of a game. The most Tyrod has done in his time here is run an RPO.
https://www.arrowheadpride.com/platform/amp/2015/7/10/8920501/kansas-city-chiefs-importance-packaged-plays-alex-smith
The talk about Arians should hit home, he didn't want any part of college QBs who did nothing at the LOS in college.