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.
Every morning Tom kissed Della and set off for work. Delia stood at the window and waved good-bye