They could still implement these things in the app and put them behind a switch for users who care about independence more than one specific type of anonymity. Explain the tradeoffs on the settings screen.
The only valid reason to be against an optional feature is the maintenance burden, I don't think it's too much here but I also can't speak for the Signal team.
The only valid reason to be against an optional feature is the maintenance burden, I don't think it's too much here but I also can't speak for the Signal team.