I normally use flight controllers in quadcopters, but you can use them for airplanes too, there are a handful of benefits when using an fc in a fixed wing, like stabilization, osd in your fpv system, ...

It’s the stuff of science fiction: walk out to your airplane, strap in, and, instead of a control wheel and assortment of dials and levers, you are presented with a slender device resembling an iPad.