Signal and power cables have very different technical requirements in terms of frequency spectrum (digital!!), resistance and impedance as well as power transmission. I fail to see why any one manufacturer would have a consistent advantage given different characteristics of the various components (of different manufacturers and In- and output characteristics) of a system. That manufacturers claim advantages is purely down to vested interest
How important is it that all cables come from the same manufacturer?
My cabling needs are (1) Ethernet to server, (2) USB from server to DAC, (3) balanced XLR from DAC to amp, and (4) speaker cables.
All other things being equal, should all cables be from the same manufacturer?
Same with power cords. Is there a problem using different brand cords with different components, all other things being equal?
PS, I know all other things are never equal, but trying to isolate the “mixing brands” issue to assist in decision-making.