There wasn't that much more story to tell. They already padded it latter seasons with stuff that was originally trimmed for the show, before realizing nothing would be coming out for them to further adapt. So the choices were 1) End the show without ending the story 2) End the story or 3) Tread water with filler until something else to adapt came out.
Sure, there could have been some more minutes in these last two seasons. But ultimately I'm pleased with the conclusion the story got, even if it wasn't up to everyone's expectations.
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