maybe what you mean by a vacuum cleaner can be different from other perceptions.
I have seen at a friend's house, what you say but he just rounded and saw how it works which is also quite good because it is automatic when moving and quite good. but the volume taken is not much so it seems to me not suitable and not too interested because it seems like my house is not suitable, the place is too dirty and not fine dust. the aspirated volume may be small, and not only dust but also water.