I agree, all those cords do seem to be a waste. Even in most PC(s) those cords just sit around in the case forever ... not hooked up to anything.
I think there are other supplies. But one of the reason RJ went with these ATX supplies is that they are mass manufactured and sold in quantity (its a large market, the PC market) and as such, prices are low for them, regardless of whether you use all the cables or not. If you select a modular supply, then you can just plug in the cords you will need. Most of these, however, are not modular as those typically cost a bit more. One you get into the other supplies, your talking a much smaller market ... and supply & demand on those ~ higher prices.
I mean, many other RGB users are buying inline 12v supplys with 2-3amp ratings and injecting and re-injecting and those are about $8-10 each ... but you have to buy a lot of them, so the SS Hub design (I think) scales well, but isn't the best for scattering all over the yard, unless you use lots of hubs and smaller power supplies ... and smaller hubs may be coming in the future. It might be nice for those smaller supplies to just accept an simple power injection supply, like the $10 variety?