Some writers are also stronger in fiction than mechanics, while others are stronger in mechanics than fiction. In a perfect world, we'd have The Rules Guy, who'd handle all the mechanics, while everyone else fluffs it up, to insure that every rule lines up since they were all made by the same person, BUT, I don't think we have anybody who's flawlessly able to churn out guns, cars, spells, cybernetics, and so on.
With that not being possible, we try to kick ideas around and help one another out, but it isn't a perfect system. I know I'm utter pants when it comes to making spells, for instance. Playtesting catches some bugs, but there's orders of magnitude involved ... say you have five writers, fifty playtesters, and five thousand players who buy the book ... you can probably guess who'll catch more flaws.

This is why we try and harvest things and make errata, or at least see if things are operating as intended.
For instance, in a video review, a couple of Aussies started combining LImnal Body with DIgigrade Legs with Skimmers, to see how fast they could go (The answer is 288 KPH, by the by) ... while not what was intended, I'm personally not inclined to ruin the fun of someone who wants to be a hovering panther-legged Centaur-man who wooshes down highways while sounding like a Pod Racer from the Phantom Menace. It's an exploit combination that I didn't plan for, but that comes with a host of drawbacks.
At any rate, keep the errors rolling, and we'll try and get to them ASAP. (I wouldn't expect an official FAQ/Errata until after GenCon, however. Pretty much the next month is all about that. As Xmas is to video games, GenCon is to RPGs, for both good and ill.)