It certainly does. Ever since they started writing fiction about robots, they imagined robots as intelligent beings among ourselves. No one thought of robots as mechanical arms that replace your jobs. So first of all, there is no reason to think why the humans wouldn't want to make useless robots.
You may have heard of the karakuri dolls from the 17th century, that serve tea (pretty useless, huh?):
Or the digesting duck from the 18th century (even worse):
that you would argue that they don't make sense and they did not bring the technology forward, but that is not entirely correct.
There are many aspects why such robots are useful:
- Psychological effect: As a human, you would probably be creeped out if you suddenly start seeing humanoids walking around. Useless robots (as well as fictional books) help the transition from our current life to one with robots.
- Technological effect: The useless robot could well be (and probably often is) the testbed for a new technology. The dancing robot may indeed be a prototype on which a system that keeps the robot in balance is being tested. Since dancing is more difficult than walking or running, the balance system on a robot that can dance can very well perform on one that merely walks.
- Cultural effect: In this subject, the Japanese come to mind. I am not thoroughly familiar with the Japanese culture, but they certainly seem to have a knack for robots that mimic a human. By your definition of "useless", we humans all more or less are useless, so it is ok for them for the robots to be that way, too.
On the second part of your question:
are robotics really moving forwards as manufacturers say?
I would again say yes. Most of the advances in technology (robotics included) is not made public, and by public I don't mean engineers and scientists, but your average teenage girl. You would probably never even hear in the news that they had made a super fantastic
<whatever> for robots. All you would probably see is the fun robots that people would enjoy watching.
I merely work in a lab and hear every now and then who does what, and I certainly believe that robotics is being developed quite fast!
To answer your comment:
But what about using new technlogoies[sic] as deception of customer when saying this will help you; and it finally won't in most of cases.
I'm afraid we live in a world of greed and lies. You hear all sorts of advertisements on all sorts of useless junk every day from companies that want to get more and more money. And you should note that any company that mass produces robots (or any other thing) has only one goal: sell those robots. It's not just robotics, so any effect such false advertising would have on people, you should ask psychologists rather than roboticists.