Does this template make use of a offline-first approach like the RBP?

[Bharateshwar]

Offline-first
The next frontier in performant web apps: availability without a network connection from the instant your users load the app.

This is a feature the react-boilerplate flaunts in the README file.

Is this feature available in this template too?

[Can-Sahin]

Nope. Its removed by CRA as well. Its optional and you can enable with little effort following CRA documents

[Bharateshwar]

Cool. Thanks for the quick reply. :)