I know absolutely nothing about coding (beyond Applescript or FileMaker or the like). But this is a really good question. Excuse the ignorance that follows:

Is Macintosh programming of the sort that the question is speaking about easily done, as in, is it designed in any way to be as user-friendly at the programming level as it is at the user level? Or would that be the "object oriented" approach to which the abortive systems of the 90s were heading, but never reached (OpenDoc et al.)?