SpaceX has made a tremendous achievement in recovering 11 first stages so far, and recovering one after re-use. However, the re-use of the Dragon capsule during the CRS-11 mission was over-stated. What was re-used was the pressure vessel. This means that the craft from the CRS-4 mission was stripped down to its hull and then rebuilt. It’s essentially a new spacecraft built upon an old shell.
SpaceX is not able to re-use the capsule after it lands in salt water without this complete rebuild. Someday they may be able to achieve full reuse, when they can land the capsule on solid ground.