Best example of useless Gear on a character, ever.

There are characters that use all of those, though the lower-level ones drop in excess quantities in the challenges. Hang onto them.
If you do want to sell some of the stuff you have hundreds of, you need to do it before the patch. But you will get very few credits for them.
They said they have no current plans to provide a use for these extra items, which doesn't make a lot of sense. But maybe that will change in the future.