These boards are a combination of a SOM (system on a module) and a baseboard. The SOM's are actually designed to be used in commercial products, so they are sor

These boards are a combination of a SOM (system on a module) and a baseboard. The SOM's are actually designed to be used in commercial products, so they are sort of in the middle ground. You don't have to design a complex multi-layered PCB for the FPGA BGA, you can just replace the baseboard which should reduce complexity. Mini ITX board will be relatively very large and consume tons of power. Maybe OK for large robots, but not for compact low-power designs. If you can meet your requirements with a raspberry pi, or a single ARM style processor, then most people would choose that. FPGAs, especially the SoCs (multi-processor + FPGA) are used when HW acceleration & fixed low-latency are important, and also there is a lot of flexibility for customized peripherals.