I have always believed design should be directed at purpose. For kites, that means ultimate performance for the intended activity. I have also, since early sailing days, firmly believed upwind ability is the mark of performance for most any exclusively wind-driven craft.
Clearly it is an advantage for numerous reasons not the least of which is safety and convenience. In reality, upwind ability is a matter of degree and as it improves, becomes more difficult to achieve. A challenge of detail and precision often with hidden secrets only found through trying unusual combinations of parameters.