It could be helpful if your computer can communicate directly to components, like sending control to an LED or read sensor data directly from your computer. 

This device is using FT232H, a chip that is similar to is USB-to-serial version, but adds a 'multi-protocol synchronous serial engine' which allows it to communicate to other components that use SPI, I2C, UART, JTAG, and more. Several digital I/O pins that can read and write signal data.

This module operates at USB Hi-Speed 480Mbps rate; this fast single channel bridge chip features either a flexible serial interface or a parallel FIFO interface, with data transfer speeds up to 40Mb/s. 

This module could substitute when you want to use another programming language like Python to test a device that uses quickly SPI, I2C, or the general-purpose I/O.