My pet theory is that philosophies have been developed in an engineerly mode of making, with emphasis on the thought system, and to be evaluated primarily epistemically: “is it true?” The Pragmatists improved on this by asking, “does it work”?
But I believe the pluralistic insight requires us to take a designerly approach to philosophy by expanding the questions we ask of philosophies to those of design (as originally posed by Liz Sanders): “is it useful; is it usable; is it desirable?” And human-centered design has taught us always to dimensionalize this triad with “…for whom, in what contexts?”
Very few people grasp what philosophies are, and how and why they are so important. They use philosophies that lead them to believe their philosophy is their belief system — the things they believe to be true true and the means by which they evaluate these truths. They think they know what their philosophy is, because their philosophy points them only to their explicit assertions and arguments, and this sets sharp limits to what they can think and what they can do with their thoughts.
Philosophies are the tacit thinking that give us our explicit truths and our sense of reality. We had better design them well! But we keep engineering them… for other engineers.
Maybe philosophy is waiting for its own Steve Jobs.