Yes. I always put seatbelts on big stuff in the rear seats

Absolutely.

Also the person that ties down loads with multiple ropes | straps truckies hitches and stoppers. Not to mention sopping every few hundred miles to check tensions and reset as required.

Loose loads are a pain in the arse and often dangerous.

A soup can rolling loose and jamming up under a brake or accelerator pedal is something that really happens .. and it's no fun when it does.

BTW I wonder why space behind a pedal is still a thing. If I were building a car, I would make it impossible to put anything under pedals, much like you cannot jam anything below a piano key.

Making a really tight seam is its own problem-- ever encounter an old piano with keys that stick?

I just put them in passenger foot area, good enough.