I think most of the suggestions are pretty reasonable, but just too much. We should be happy if they even add 1/10 of that what the user proposes.
Though some of them are a big no- go, as they either change/weaken the plot or ignore the special relationship between Yen and Ciri
This two in particular shouldn't be added under any circumstances:
-Ciri's conversation with the Lodge (Triss should be present there if she's our love-interest).
-Triss should be the one saving Geralt instead of Yennefer from The Wild Hunt hounds (After defeating Eredin and she should be the one riding with him to the tower or play a significant part in it)
I agree.Yen and Ciri barely have any interactions in the game as it is.Cutting out the scenes that they have will make it even worse