Basically you have the details from the Dataset page, why should it be mixed with the others ?

Because maybe it contains code and logs on how to prepare the dataset. Or maybe the user just wants increased visibility for the dataset itself in the tasks view.

why would you need the Dataset Task itself is the main question?

For the same reason as above. Visibility and ease of access. Coupling relevant tasks and dataset in the same project makes it easier to understand that they're linked together.

Not sure I can imagine one, can you provide an example?

Yes. Because my old https://github.com/allegroai/clearml/issues/395 has never been resolved (though closed), we use the dataset object to upload e.g. local files needed for remote execution. These are not the same as actual datasets, but can be reused and can be useful for introspection.

What you mean here is, if the dataset ".dataset" project is already hidden, why do we also "hide" the Tasks inside ?

No, I mean why does it show up in the task view (see attached image), forcing me to click twice on the same project name.

I'm a bit lost of words in describing this. Would be happy to show quickly via e.g. a Slack call/huddle.