Why not? “~= 0” just means we likely will be unable to measure any effect. Not that there literally is no effect. Us being unable to do science on something m

Why not? “~= 0” just means we likely will be unable to measure any effect. Not that there literally is no effect. Us being unable to do science on something means we cannot scientifically state that it does not exist. Not that we can categorically state that it does not exist.