Hello vacbear. If my memory is correct, the bracket on the Meile floor tool was rather substantial. Therefore it can handle being parked during cleaning. But I am sure they were not meant to be stored in the 'parked' position, which was why Meile allowed the tubes to be clipped to the cleaner -was it the side?- when the cleaner was stood on end.
I confess the first I ever recall being aware of such features was when a family my mother cleaned for invested in a Rowenta Powermaster. Mother would have been about 70 at the time and I know she said the cleaner was heavy to carry, but having the tubes clipped to it was something of a help. She also loved the on-board tool compartment. As I have said before, her own cleaners were an Electrolux 504 and 302, and I don't think any of the homes she had cleaned had ever had anything much more opulent either. She was not normally a woman who was swayed by gimmicks, but she did like what the Powermaster had to offer, such as 3-speed motor and the tools of course.