Today, when having a notification about low washer fluid level, I thought of my previous car that didn't have washer fluid sensor. I ran several times completely out of washer fluid. Yet in this particular car, this resulted in no bad effects.
Is running completely out of washer fluid harmful? Can it damage something such as the windshield washer fluid pump?
My experience with the previous car would indicate the answer is "no", but this would be a generalization from one car to all cars.
Let's ignore the obvious danger effects of long drives in dirty conditions and focus only on mechanical effects in the car.