i dont actually know much on this topic, i dont like park, but in general, straight airs are fine for me. just tuck it, keep it tight, and land. but im more of a steeps person, not park.
anyway, jaime pierre almost never does a straight air off a cliff. doing a grab or at least something gets your mind of the landing and if your messing up or not. especially when you have like a full 3 seconds of freefalling, literally millions of things go through your mind, like how your going to land, what youv done wrong so far and etc. but he says when you throw in at the very least a grab and maybe a flip, your mind is concentrated on the flip, not how huge your going which tends to freak people out.