The Vorwerk is probably often praised because it delivers a very good overall result. However, it is really not an inexpensive device, as many of the installed, admittedly very useful, components (and of course also the name) simply cost money.
Since everyone has their own preferences and expectations regarding the performance of a vacuum robot, there will probably never be "the perfect device" for everyone.
I think it is similar to cars. For one person, the comfort and performance of a Porsche Cayenne are worth at least EUR 67,000.00, while another is happy with their Dacia Duster for at least EUR 10,700...
Therefore, everyone should be free to decide which vacuum robot suits them.
Regards,
Dirk