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 t

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.