Both!
No Quote Tweets (technical), and Black folk being talked to disrespectfully for asking for them, and explaining how they're not just for dunking on people, and how hidden replies are worse (people).
No shared blocklist for nazis (technical) and people being disrespectful to Black women that explained why trust and safety features are needed (people).
Poor ability to filter feeds (technical) leading to HOA policing and telling people to CW everything (people)