HF and CCC are about growing up and leaving escapism behind

>Waifu culture is bad
>Say goodbye to your servant, symbolic of letting go to Otaku trends and becoming a real adult
>accept boring world, move on and become a salary man so you can be happy
>get nympho wife so you can improve Japanese birthrate
>Clearly the problem is otaku who like 2D girls
>it's time for you to grow up, get a job and then a big titty wife and stop with all this escapism (Kiritsugu's ideals) nonsense
>just get a big titty gf and get a job. it's that easy
>HF has the character completely break down as he is forced to realize that living up to the ideals he had cherished would require killing the person he values the most, Sakura. The knife scene is basically the lowest the character falls throughout the entire VN and the story concludes by having Shirou battle Kirei to the death, a dark and twisted mirror image of our protagonist, both distorted by their inability to experience regular human happiness and their views that they are sinners. Yet while one has chosen to keep walking his old path, the other has chosen to abandon it for the sake of his own happiness
>HF final ending where literally the theme of the story actually comes together, about how the grail war was mistaken from the start and they needed to just let go of it, with Ilya tying together her character arc from the entire game about also putting her hatred aside and making peace with her family, when the other ending doesn't address shit and leaves you on a shitty note
>Archer wanted to make Shirou give up on Kiritsugu's stupid ideals
>If he didn't save Sakura at any cost he'd loathe himself for the rest of his life and then some just like Archer
>Sakura frees him from his obsession with Kiritsugu's ideals which stems from the colossal trauma
>Sakura gives Shirou true love, family and a reason to live for unlike Kiritsugu's and Archer
>theme of CCC where Hakuno goes back to Earth at the end

Sakura is Shirou's canon wife.