This is debatable, but since you asked, here go my cents:
A wheel has three "parts": rim, hub and spokes.
Spokes have two functions:
- Sustain the vertical forces on the wheel (weight of the rider, landing, etc.);
- Transmit torque while accelerating (rear wheel only) and braking;
Any properly laced wheel will do it, but there are many ways to design the connection of the spokes to the hub, or to the rim. These manufacturers have chosen to make the spokes "elbowless", which could result in less chance of failure, and could result in other side-benefits, like flangeless hubs, or fancier-looking wheels.
I'd much rather use standard components only, since they are easily replacable and swappable. I sometimes damage some rim, then I can change the rim only, because the nipple-hole connection is standard. I also can change the hub if needed, because the flange-elbow connection is standard. In the other hand these fancy wheels are proprietary, and you have only a single source of spare parts, which tend to be VERY expensive and sometimes are not available on the shelf.
As a bottomline, my spokes tend to break at the elbow, rarely at the thread end. I don't use butted spokes, so that could make some difference. Recently, I had some breakages at the mid-length, but I suppose this is due to excessive weight per wheel (tandem) and sub-optimal quality spokes.
Final thought: I would only spend big in such a wheel if I have a very well-defined reason. These are made for racing, and for anyone who doesn't race (and isn't sponsored), I'm pretty sure the cost is too much for the benefit.