I don't remember ever riding my low trail bike without at least something in the front bag. I don't recommend it. I'm not sure I could make it to the first traffic light.
It doesn't take much weight though, spare tire is enough.
High trail and a rando front bag is scary like an overweight truck. I also had trouble with forced shimmy if I ever shivered from being cold. I rode a bike like that for quite a while and kept wondering why I didn't make a lower trail fork.