If the following verbs in bold talk about actions in the past, why we don't use the simple past instead?
Tom and Della were a young married couple. Every morning Tom used to kiss Della and set off for work. Della used to stand at the window and wave good-bye. In the evening she used to welcome him home and ask him to tell her about his day.
For instance:
Every morning Tom kissed Della and set off for work. Delia stood at the window and waved good-bye