Proper headstay tension with furling unit

[Brion Toss]

Hi there,
The backstay should be smaller because it has less load than the jibstay: the angle is greater, and some of the jibstay load is siphoned off by the weather upper. Making both wires the same size would gain you simplicity, but at the cost of weight, windage, and expense. tuning gets tricky as well. Oh, and you'd need to accommodate the larger pin size needed. Is it really worth it, just to limit spares? The boat has needs too, you know...
Fair leads,
Brion Toss