newbie: Why do I need a carrier board for the ADRV9361-Z7035

Hello, I am trying to understand the purpose of the FMC connectors on the ADRV9361-Z7035.  This board integrates the transceiver and the FPGA, so, is the FMC interface meant to be used as a breakout connector to gain access to the FPGA's I/O pins?

I could understand it if the board only had the AD9361, and provided this interface so you could I/F to different FPGA eval board designs (z7020, z7035, etc).  But, in the case of the ADRV9361-Z7035, the FPGA in intergrated, so what is the intended application for these FMC connections?

Thank you