Seven’s situation is different from Picard’s.Seven reffered to herself constantly as a Borg in Voyager and did so for pretty much the run of the show, the difference was she was an individual choosing to be part of a voluntary collective.
She also continues to go by her borg designation suggesting she still has strong ties to that identitiy.
Seven was assimilated as a child. It would be the equivalent of a kidnapped kid that lived their entire childhood under an indoctrinated persona. Even after being freed from that, it’s not like children can slide back to who they’re really supposed to be after years of living under their kidnappers.
I take her keeping the name as not still feeling any sort of affection for the Borg, but being true to the confused identity she found while on Voyager.
What happened to Picard is to me totally different. His situation is the equivalent of a rape victim forced against their will to perform acts, and to shame him for it is totally misplaced anger.