The goal for Stroud might have just to be a highly drafted QB and Day has most likely help him to accomplish that. I think for alot of QBs know they might not even get a chance at the NFL but CJ Stroud was rank #2 pro QB out of high school, the expectations were there for him.
Day has coached 3 highly drafted QBs since he has been with the Buckeyes. Stroud should be the 4th. When Fields came to the Buckeyes it felt like it was more of a stop over than he came to accomplish something big in college. Maybe Stroud had the same attitude.
Day has created and recruited an offense that showcases QB talent for the NFL. He also has shown he can help to develop them.
There might be a difference in mentality of the #1 or #2 QB prospects vs guys that are #6 or #8. There are only 32 starting QB jobs in the NFL and when it doesn't seem like a given that you will get a shot, accomplishments in college might mean more.