That's not to my mind Exploration that's closer to tourism with the Codex being your holiday destination brochure including photo's, description and an address. You haven't discovered anything new you're just viewing first hand someone else's discovery. This in itself is not a bad thing btw the Codex serves a useful purpose, it could be used to give clue's and insight into what else there might be along with the Exploration tools to seek out new things. In fact the Codex has unconfirmed undiscovered items as an option its just not being used or the content isn't there.
My point and bone of contention in all of this is... If you go off into the void on an exploration expedition sooner or later you need to get some gameplay return on that venture otherwise it becomes pointless and demoralising. At some point having honked, scanned and probed enough systems planets etc you're going to get salty at the lack of anything new particularly if you are seeking something specific e.g. clues to the Guardians. Treasure hunt? Maybe if you consider the expansion of knowledge being the treasure.
Frontier have given us better 'Exploration tools' not better Exploration. I said this would be a risk when we got the first preview and that's exactly what's happened imho.
No, tourism was what we had in pre-3.3, where you literally could only find these interesting things if a tourist beacon had been placed there beforehand.