With no dependency on internet speed to load and test your website. It increases development and testing productivity.
Get independence in adjusting the server configuration, database, etc., to match different conditions and completely control the testing environment.
With no internet exposure, the risk of potential attacks is low, almost zero.
Get direct access to the error logs in the local environment and manipulate the environment as needed.
Developers can easily try different versions of software, plugins, or coding techniques and see their effects without impacting the live site.
Testing changes on a live website can cause downtime and a poor user experience. Local testing avoids this issue.
Changes made in a local environment can be seen immediately, without the need to upload or refresh the server, speeding up the development process.
It gives a safe space for new developers to learn and for experienced developers to experiment without risking the live website.