Why Desktop Apps?

There are many benefits of using Desktop Apps over web apps, or fake desktop apps that are just as Web App in a window. The main benefits involving performance.

Web Apps, and "Web App in a window" apps (Teams is a good example) are known to be extremely resource intensive, particularly on memory. When you use a Native Windows, Mac or Linux app (or even an application built with a Cross Platform Framework) you get full access to the device without the need to use up as much memory. This will allow your device to run cooler and faster.

Desktop Apps can still be used with Cloud based services and back ends. You don't have to use a Web App to make the most of the cloud. Plus they tend to be easier to use instead of having a custom interface.