Can any of you truly say that there's a better way to communicate "hey you can't fix this" short of putting bold fucking text saying "HEY YOU CAN'T FIX HIM, FOR REAL LOL" at the bottom of the scene? There's literally nothing more I could have done to tell you that he's unfixable short of just removing the scene entirely and letting the player figure it out, but I think everyone knows where that would go. The garden is meant to be a bit of a sanctuary for him, so he is "healing" in the sense that he's more or less at peace.
On a tangentially related subject, the game communicates "this is a serious decision which is irreversible once made" more effectively for you picking a color for Sugo's caparison, which doesn't even show up on his picture, than it does for many of the game's most portentious decisions (eg sabotaging Arona's plan by attacking Argoth directly, thereby permanently removing the entire warcamp and several characters along with it). Bold text PLUS a "are you sure?" prompt is good technology to have in the game, and maybe there are artistic reasons for not allowing it in all cases, but it seems weird to have it in places where it doesn't really matter at all, and not have in in places where it borders on ruining your game because you walked blindly into a wrong decision.