There are several reasons why PWA is gaining more traction in ecommerce these days.

Some of their benefits include its numerous advantage offered for the end-users like no installation required for having the app on a smartphone. It enables to

1) Add the app to the home screen 2) Provides native app-like experience 3) Quick loading in the blink of an eye 4) Less data consumption 5) Offline functionality using service workers 6) Easy maintainable

For getting more info about the benefits: https://www.purchasecommerce.com/blog/progressive-web-apps-f...