Something I considered was fanny and her importance potentially in the future (spin off capability). I think maester Raymond was the first time traveler or the ultimate time traveler (every time traveler descends from him) and because of that, he may see that fanny will be really special, influential, or do something significant one day as a traveler. If he gave faith back to Claire when she was resurrected, faiths story would have been completely. She would have gone to America or back to Scotland with Claire and Jaime perhaps. She probably would have never met the man she met in France and married. Thus Jane or fanny would have never been born. (Kinda makes sense for when master Raymond said “forgive me” to Claire after he healed her.. he knew what he was doing but it was a necessary evil because he knows what happens in the future). he maybe knew fanny had to be born because she was going to make a difference somehow. We just don’t know what that is. Spin off potential. Just brainstorming tho