Looks like it could cause a lot of damage if at the end of a pole 2-3 storeys up as you wouldn't be able to know exactly how much pressure your applying without actually scratching the glass loads
With the squeegee rubber backing the blade allows the blade to flex.
So it conforms to the glass.
Also one of the reasons we put a handle that you can hold and also put on your pole.
Is that window scrapers with this size blade generally bit awkward to hold and they are unable to be attached on pole.