It's not a hard lockout to fertility, just a nerf to overall child births. On average every couple gets one less child when you're over 30 characters in a court, and if for whatever reason you're having bad luck rolls that can end up meaning only one or two kids for your Queen/King. Which can be very dangerous!
And as for the Knights..At least they will never actually press the claim. Holy Orders will not fight brothers/sisters of the faith.
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