To me, it is simply a sign that WotC should stop wasting customers' money and reprinting stuff in different books. Each book should have fresh content.
Except different settings need Goblin Stats, so they reprint, alot, but if Goblins were in the PHB, that would free up space for fresh content in ERftLW, VGTM, and GMGtR. Because folks who want to play Goblins innRavnica, might not want to buy an Eberron book to do so, so Goblins end up keeping getting reprinted. If they were in the PHB, that wouldn't be an issue.