Seven beimg rejected from Starfleet is exceptional. Had Voyager died in season 3 and we gotten a late 00's Star Trek series with out talentless hacks behind it, a former Borg crew member is such an obvious go to it would almost be cliche.
"Oh, they just did Worf but with the newer big bads"
A diverse cast(that isn't just skin deep) is what draws people in on Star Trek, even fucking Orville gets that.
-Mr Spock in TOS(plus for the time you could argue Uhura and Sulu).
-Worf and Data, to a lesser extent Troi, on TNG.
-DS9 you have former Terrorist Kira(and the rather unique for Trek of the religiousness of Bajor), a seemingly unique Shape shifter, a symbiotic lifeform living with another person, a criminal Ferangi and his family, eventually a Glowie Cardasssian. I think DS9 is considered the best by some people cause it had so many characters that were alien in concept to a normal human character.
-Voyager starts a little weak, we get a Vulcan, which were kinda sparse in TNG and DS9, Nelix and Kes weren't given a lot of alienness, the Maqui are just wasted and almost forgotten by season 2, Bellanna just retreads Worf as a Klingotto, but weaker. The Doctor, what was essentially an appliance that grew into an individual as a consequence of necessity, was their best "different" character. While he similar to Data, he's a different enough take on it to not feel like a retread. Seven eventually joins and while it's joked that her massive Borg implants are what made her popular, it was more the the uniqueness of someone that largely grew up in a collective hivemind discovering individuality.
I didn't finish Season 1 of Picard, but it doesn't spend any time on developing characters anyways, so the girl that doesn't know she's an Android and the autistic Romulan murderer don't get to be explored and tell interesting stories with characters that don't think like normal humans. And from what I hear, they are just yeeted in season 2, and we have an all human cast for season 2(RLM stated it seems like they just soft retconned Android Picard)
I'm not sure about Brave New Worlds, I've not been talked into it yet, but I'm listening. However, to me, what makes a show feel like Star Trek is episodic nature, and a cast of characters with interesting distinctions from human beings.
Which is why I'm looking forward to it's cheap knock off that manages to do a competent job at playing with these tropes, the Orville.