I don't understand why you're so negative about Streveler. Obviously if he is turning the ball over it's not good but a lot can go into a turnover such as poor route running by the receiver, bad hands on the receiver, poor Oline play, poor play calling, and plain old bad luck.
He'll never be Matt Nichols, they're very different types of players. Nichols is a pocket passer, very slow of foot, and somewhat fragile, very cautious with the ball and risk averse. He is somewhat reluctant to fire the ball into tight windows or to stretch the field vertically but he's very good at making the safe play.
Streveler is a much more mobile QB and is very intelligent, a stud of an athlete with a strong arm, good speed, and tremendous heart. He's not afraid to take chances and will challenge a D by firing the ball into tight windows. He is not a seasoned vet like Nichols and is somewhat more prone to making mistakes but he's learning. We're damned lucky to have him. The last time he played the Riders he pummeled them and had them off balance all game. Give the guy a break.
https://www.cfl.ca/2019/09/07/streveler-is-a-man-on-a-mission/