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From Experience, Alignment of Fabric bias is only "not an issue" until it is.. For Fabrics like Icarex, it's much less of an issue but when Ripstop (RSN) gets wet and starts stretching, those alignments matter because the stretch is uneven along the biases. It doesn't take too long to get the bias of the fabric aligned in most cases so IMO it's worth it in the long run. At a minimum, your bias alignment should match on the mirrored panels so when stretching does occur, it does so somewhat evenly. FWIW, I've probably played with the bias and mismatching of fabrics as much as anyone (more for refractive purposes than stretch) and I'll take the extra time to align the biases every time. I've also never used a walking foot but that's a different conversation..