If Ctrl is on the outside I am guaranteed to hit Shift when I push them both with my pinky straight up.
I have two Lenovo laptops in front of me right now.
The key straight up from Fn on the Ideapad 3 is a pipe. On the Thinkpad the shift key is the correct length (two keys wide).
The two have opposite Fn and Ctrl keys.
Consistency, am I right?
Muscle memory is a thing, and even the same manufacturer isn't doing things the same way between models.