Is the female titan pointless

So we were told that the female titan mimics powers of any of the 9 but that's dumb since falco's jaw titan mimicked the beast titan traits when ingesting zekes spinal fluid so if any titan can mimic traits, what does the female titan actually do. I belive Eren mimicked traits of another titan when he drank the armour bottle and suddenly could harden with perfection an entire structure to keep the cavern from having in completely

Edit : after thinking more about it, is a special unique ability locked behind a royale blood trait similar to the founding titans powers.

Edit 2 : after thinking more, the attack titan is similar since eren needed zeke's royal blood to manipulate grisha and kruger

Edit 3 : i think I found it out. Many people referenced the scream but it doesn't seem unique enough so I have a theory that it's scream ability is the ability to control all and any titans in the hand of a royale blood similar to how the attack titan can peak into memories but when Eren touched zeke, he could directly manipulate the past. This would be unique since we have to assume that like Zeke, anyone other than the founder can only control titans that they created, so the female titan could be a control titan that can't control since Annie isn't a royal blood eldian.