But how do you know that Gillian wants the exposure The X-Files gives hers? And why was she so hesitant to sign for s11 and why she says she’s done if she’s not? (I’m not a GA fan who wants her free for TXF, I’m an XF fan who even defended last season and loves to have more)

Because she’s a famous actress, and like every actress, she needs and wants exposure because without it, they die. Not literally, but you get the point. She has vanity in her, that’s her words, not mine, like Everyone else in this business. And i don’t say that in a mean way, actors needs vanity to do their job. They have to like being in the light, if not, they’d chose another job.
I don’t think she was hesitant. To me, this is just storytelling for media and for the public. I think it was only a matter of money. Nothing was about the plot, or the fans. Plots, fans, and range of acting don’t really matter anymore when there’s so many zeros aligned on your paycheck. I think negotiations took a long time because of the money she asked and maybe because of the number of episodes she signed for. But to me, she’d agreed to do season 11 way earlier than we think.