From the original post: > The right approach for the top level rarely matches that for most of its parts, nor each for the others, and likewise down the line.

From the original post: > The right approach for the top level rarely matches that for most of its parts, nor each for the others, and likewise down the line. Unless you want to use a different language for each level and subproblem, you will want support for all "orientations" in your language. It is grossly impractical to use a different language for each fragmentary part of a problem. People do not, as a rule, do that. Trivial exceptions include Python and niche-language programs calling out to C-ABI libraries, programs sending SQL to databases, and web servers sending Javascript to browsers. But those are not about "orientation". You might use two or more different general-purpose languages for different, independent problems, but that does not contradict my remark about the folly of languages that attempt "purity".