Here are reasons you may want to make a Google Meet recording:

For documentation

Nowadays most organizations prefer to have an archive of the meetings for documentation purposes.

As a Reference

While most people still take down notes, it is always helpful to have a video copy (especially for classes and important meetings) so that you could watch it again in case there was something you missed.

To create a simple video presentation

You can also use Google Meet to make simple video presentations.  This will come in handy for making video reports, tutorials, and presentations, especially if you do not have any video software installed on your computer.