A comment of mine on X, stating that I don't see a use case for humanoid robots, generated a lot of opposition...

...but the opposition under that comment honestly further convinced me that humanoid robots are completely idiotic.

The best, because only, arguments people come up with are:

1. muh general robotics
2. but the world is built for humans!11!

Well, then it seems there are no good arguments.

Why the Arguments Are Bad

1. "General Robotics"

What kind of argument is that supposed to be? For the requirement "generic," you need to argue for concrete designs. Jumping straight to humanoid is not an argument, but a conclusion without reasoning. WHY should the humanoid form follow from this requirement?

2. "The World Is Built for Humans"

Superficially the somewhat better argument, but also not sound. It only shows that a humanoid form is somehow "sufficient" (even that is doubtful—humans use an insane amount of tools to get by).

But it shows absolutely nothing about why it should be ideal.

Concrete Examples

Two arms are simply not enough. How often do you wish for a third or fourth arm, especially when doing manual work. Conversely, more arms in moderate amounts have no discernible disadvantage and don't restrict how well a robot can operate human-made vehicles, tools, and machines.

Being bipedal is completely handicapped. That's why nature doesn't "actually" know this design either. Evolution is shockingly bad at changing fundamental blueprints, and humans are rebuilt quadrupeds with higher vision and hands for tool use.

Bipedal "balancing" constantly requires energy, which is why the whole world is full of seating or at least handrails. At minimum, a third support leg or some kind of kangaroo tail would be a strict improvement.

In fact, walking on flat, hard ground—which humans have created everywhere in urban environments—is orders of magnitude less efficient than driving. Everyone notices this when they ride a bike.

So a robot should have wheels. They can be lockable for climbing stairs and such.

The whole construction with sensors and brain in the head is one huge lazy compromise...

Conclusion

I'll spare you the further examples and explanations; ultimately, I could go on like this for pages. Bottom line, I'm firmly convinced that humanoid robots are a completely idiotic design even for "general robotics." I'm always open to new arguments, but the reactions so far rather suggest they're in short supply.