Why are stores constantly closing in center city?

Center city resident here, and over the last 3 years I’ve noticed more and more stores close with nothing replacing them. Target in Washington square, Multiple pharmacies, recently the giant, macys, and now vans store in rittenhouse.

Was Philly always like this? It makes me question staying here long term when the city can’t even keep retailers in the most populated sections.

I’m worried I’m going to end up in a food desert in a couple years.