I presume you're joking, but the air space is actually there to make the box satisfying to shake. That's why staples (which no one wants to shake) are in tight fitting boxes.
They're threaded all the way to the top, so they're mediocre.
Awesome screws don't have threads in the first piece of wood. That way, they'll pull the boards together as it free-spins in the outer board and tightens the second board.
Threads all the way through can leave a gap in your joint.
(not OP) Because Philips Phillips sucks and I will die on this hill. It is way too easy to cam out and strip the head. It is the second worst commonly used head, only marginally better than the flathead. Pozidriv is better, but only by a little.
Torx doesn't cam out. Hex doesn't cam out. The Robertson head (square cross-section, popular in Canada) doesn't cam out.
I think I've known the truth of this for a while, just somehow convinced myself that torx was harder to come by or something. I've done a lot of DIY and for most needs Phillips is fine (and posi if you have the exact right bit attachment) It's just that occasional awkward one where you end up stripping the head slightly (and end up having to push harder on the drill to avoid this happening) isn't actually as "occasional" as I'd like to believe and was actually quite common, and annoying. Flat head screws should be cast into the 5th level of hell from whence they came. I have no idea why anyone would voluntarily use them, let alone in a situation that necessitates an electric screwdriver rather than carefully carefully doing it manually to avoid the head slipping out of the slot. It's so infuriating I can't believe they exist.
Guess what I'm saying is torx has always kind of been the obvious answer. I had a garden project recently where I needed 15cm screws and only torx variety were available, because they knew you needed the extra torque.
On reflection am just surprised everything isn't torx as standard...
Only times I've broken one was on the 3rd or 5th use of the same screw. That's one of the main reasons Torx is all I use. I can strip them from projects when the wood rots.
Flathead is great. It is most flthead screwdrives that suck. Treat yourself to a parallel groud screw driver and you will change your tune.
note that I said screwdriver note bit. Flathead must be driven by hand. With the right pilot hole this isn't hard. In proffessional settings they demand the speed and process reduction from self tapping power driven screws but I'm not in that situation.
As pointed out in said prior application, one of the principal objects of the invention is the provision of a recess in the head of a screw which is particularly adapted for firm engagement with a correspondingly shaped driving tool or screw driver, and in such a way that there will be no tendency of the driver to cam out of the recess when united in operative engagement with each other.
Another object of the present Invention is to provide a screw head with a tool-receiving recess' which may be produced by a simple punching operation and at the same time preserve all of the desirable virtues of the screw head and the recess therein, and which results in certain additional advantages, namely, the screw head is left stronger near the outer edge than heretofore possible; the recess firmly and adcurately receives the driver and causes the driver to centralize it self with respect to the screw head.
The head was designed to be cheap to manufacture by cold-forming the metal.
I've never even seen a single screw like that here in Canada. We mostly use Robertson bits (square hole) which was invented in Canada and laugh at the US for the little feud with the Ford motor company that eneded up with them using the Philips bits (plus shaped hole) for their stuff. But then all their culture leaks over here anyway and most things use Philips anyway. Construction is pretty much all Robertson.