The main reason being, and I'll restate myself–philosophy is not concerned with all concepts, only a subset of them, those that are deemed to be philosophical concepts–what those are is another matter and a very very very interesting question in its own right. This is what differentiates philosophy from other fields that use the same cognitive techniques and methods, the same proscriptions and sensitivities‡ of which there are both many fields, many methods, and many pitfalls. How all the latter translates into software is one matter and is not up for debate here. What I am saying is that computer programming (as an activity, one that is done by a human to a computer) can deal with any concept and that makes it potentially much broader in scope than what philosopher's do, methodologically they can over time be made compatible–at the moment they are distant kin.
† i've made a best guess/good faith at what that's supposed to refer to
‡ what I mean by "cognitive techniques and methods, the same proscriptions and sensitivities" is the business of conceptual analysis and construction–learning about how concepts work and how we manipulate them mentally and how we communicate them, the practice of training oneself to to avoid errors in your thinking, learning about fallacies and applying them, learning to debate in good faith with yourself and others, learning about biases in human cognition, learning to spot these biases in ones own thoughts
