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1) Some people have had trouble doing that one clear before, so you made it even harder.
2) They still have to do ini to wear the artifact.
3) They can buy the artifact, but they don't take it.
My conclusion:
It doesn't make sense.
The obtaining of artefacts through the questline (including defeating Regin) is intended as it is, requiring a full clear. As you mentioned, it doesn't make any sense to get the artefact while not being able to use it. But the concept behind does make sense indeed. 
The instance is intended to be difficult. Much more difficult than most other content in the game. It's a group content, so group setup is more important than ever before. If a guild or group is not good enough yet to succeed in there, they simply need some further progression before attempting the challenge again.
I watched groups attempting the instance several times, spending hours or even days on bosses, but in the end succeeding over them. That's the actual way how this instance is supposed to work. And by the way, the difficulty wasn't increased by fixing bugs that made players die oneshot randomly and so on. It simply was fixing of bugs, exploits and mechanics that made life worse than intended or even broke certain mechanics. We never had the intention to exclude players or groups from anything or to disadvantage anyone. But if something isn't working as it was designed to be, it's fixed until it works as it should.
Cheers. 
