The sand snakes and Ellaria aren’t highborns anyhow, so wouldn’t make sense strategically. Cersei is probably more barren than Dany, and to quote the late, great Olenna ‘too old’ - with ‘the change’ upon her. Plus the Valonquar is going to deep six her miserable hide soon. (Not sure how Lysa Arryn was ever even a…

“This is pandering to wealthy-guys’ trophy wives.”

Many of the more career-driven sort are hesitant to take the leave for good reason - they have to compete with their colleagues who have prioritized career over personal life. Taking the full leave would set them back farther.