I find it difficult to find character arcs in the mysteries and romances I read. I have read your descriptions but find them hard to apply. I have been told about the story arc in which there is a dark moment when all seems lost but am finding character arcs harder to identify. That makes it harder for me to write them. There are romances in which the characters appear to have nothing in common– sometimes except lust on the part of one–where the story is to show them that they are meant to be together. In other stories there is an attraction but the situation has to change to make marriage between them possible.
Do you count changing opinions as part of the arc?