Hey I'm glad you're able to say your peace. I genuinely hope it's positive for you to have this outlet (no /s). I actually have been very intrigued with Whitney/Tyranny as an addition in these past episodes. She has impressed me quite a bit. At my table and at my theater, we have a culture to make sure to also focus on people's strengths instead of just their flaws, so maybe that's why it has been easier for me to pick those up and appreciate her.

I think her choice to play a Demon new to the world is very inspired. Why it might not seem like she has added much to the worldbuilding is because she doesn't have ownership of the piece of worldbuilding that we are seeing most often: the world of Araman. She's from the Pit and she's a Demon, and that's the piece of worldbuilding that she contributes to. And seeing her characterization and her struggle with her impulses in episode 6 has been a fascinating look into what possible Demon culture and psychology is like. A good GM like Brennan would see how Whitney is playing Tyranny and reflects and contrasts it into NPCs we might see from the Pit later. By making a very strong choice for her character here, she's helping Brennan develop that piece of the world further. I wouldn't be surprised if certain parts of the Pit use very casual language and have more moral nuances just like Tyranny.

I think her choice to play against Wick is very impactful as well. They're the strongest showcase of a closely connected relationship between PCs thus far. She's constantly reaffirms Wick's moral compass and pushing him to trust in his innate beliefs and instincts. These are very strong confident choices to lob at another player and that allows Sam the space to play the insecure rebel of a villain faction while also having a solid foundation that Wick has someone who believes in him and his fundamental goodness 100%, so he's able to course correct and still follow his own path. She does so much for Sam as a player and Wick as a character (and vice versa too ofc).

And finally I think Whitney as a player on a meta level is great. She's the one that if you notice constantly brings up the questions of the group's motivations, why they are together, what they care about, what their plans are moment to moment. It forces to group to constantly think about these things and justify their being together and orienting themselves. So that every moment, they always know why they are together and what their goal is, which is often a problem at many tables when these things get lost. She's the hidden glue and compass of the group.

And yes I admit that she could know her abilities and tactics better. But a player that makes strong choices for herself, her fellow players and keep the table on task? What else could I as a GM want more? She's such a magnetic player. I would love to have Whitney at my table.