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As far as I can tell: (1) Yes indeed, the composition of the samples was not degraded when they were collected and returned to earth. (2) The samples indicate that Ryugu is similar to Cl chondrites (break up easily when entering earth, therefore only small fragments collected on earth; rich in volatile elements, representative of the chemical composition of our solar system) BUT Ryugu is less reflective, more porous and more fragile even than Cl chondrites.

Therefore (in my non-expert opinion): well worth the effort to collect and study because we will never find anything similar from a Meteor so these samples will give us much more evidence about the solar system's chemical composition.

Picture is here (from last year): https://www.nature.com/articles/s41550-021-01585-9

Looks a little like coffee grounds in a grinder, only if you ground charcoal.

In scientific papers the bit headed Abstract is basically the tl;dr, you can skip the rest.

In typical papers, what the abstract says contradicts what the graphs say, and what the conclusion says; and the graphs contradict the conclusion.

Papers where they all match are exceptional and precious. But we cannot trust that just any paper is among them, even those published in Nature.