I always assumed thought it was kind of cheap how Picard got assimilated but came back with his body intact. I got the impression that the Borg cut off arms for those particular attachments, and apparently eyes were removed or severely damaged after having those eye pieces attached.
Picard's came out just fine. Seven and Hugh all those years? Just some stylish metal accessories around the eye, like a Mike Tyson face tattoo.
The only explanation for Picard is that he's the star of the show and everything has to reset back to the status quo more or less at the end of each episode.
Seven? She's the hottie, and the precedent was set with Picard, so there.
Hugh? Notice he has a little more noticeable scarring, different colored eyes, scars, and a bit more metal stuck to his face. Still a very friendly face compared to the other former Borg.
I do like the concept though of rehabilitating former Borg and this project being meant to restore their humanity and integration into society. I feel like ever since "Descent" the threat of the Borg have been watered down.
In PIC, it's not a continuing watering down of them as a threat, but instead looking at them from a completely different angle and growing the concept in new ways. The Borg as a threat can still be just as intimidating if not more, but with this concept there incorporating world-building into it. What status would former Borg or "XB" have in the Federation? Interesting stuff.