First, let me make one thing absolutely clear here: this book has no fucking female lead! No female lead! No female lead!
I don't know whether you're a little frustrated, buddy, and assume any woman having a friendly conversation with a man must be his romantic lead. I don't want to know, either. If you're frustrated, deal with it yourself. I'm sticking to the facts.
First of all, I made it clear from Anna's very first appearance that she was a weapon, and I individually replied to the people who questioned early on whether she was the female lead.
Second, where exactly did you get the idea that Anna and "female lead" had anything to do with each other?
I went back through the main arcs in which Anna appeared. In the Turing arc, her primary role was to investigate Silverheart, control the AI, and help Lorgar work through his conflicted feelings after dealing with several of his Primarch brothers.
Most of the rest of the time, Anna was a scientist, with the occasional bit of banter thrown in.
Later, she was responsible for handling relics from the Dark Age of Technology and helping the protagonist develop various backup projects, such as the Superstar and the Wave Cannon.
The issue in the Slaanesh section was actually very simple. If a daemon disguised itself as your good buddy to seduce you, wouldn't you be angry?
So, tell me, how does any of that have anything to do with the words "female lead"?
Are you saying a story without a female lead can't have women in it at all?
Have you never met a woman, buddy? Do you think any woman you're close friends with must be attracted to you? Do you think the world is a dating sim? Max out her