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> What's the point of low speed single ended I/O into an FPGA module?

Hardware interfacing with the physical world. Driving small numbers of LEDs, h-bridge drivers, load switches, regulator control signals, reading buttons, accelerometers, gyroscopes, magnetometers, PWM controllers, GPS, ...

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That's what microcontrollers are for. FPGAs are harder to program and use a lot more power. So the juice needs to be worth the squeeze!

The application is what the chip is for. There are plenty of low power FPGAs and times to use them over a micro.

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