Is it particularly regrettable that a child has never traveled to a big city since he was a child?

What is the loss? It is very hard for parents to earn money to support their families. It's understandable that they didn't take you out for a trip because time or financial ability didn't allow it. So they should study hard to make money after graduation, so that they can take their hardworking parents out for a trip during the holidays, so that their parents will be happy and proud.