Once again, I'll attribute to malice what many here are so eager to attribute to stupidity (or something rather similar). Basically, they don't have any incenti

Once again, I'll attribute to malice what many here are so eager to attribute to stupidity (or something rather similar). Basically, they don't have any incentive to do so. The goal of the researcher is to be marked as an author of something that will be considered as an important result in the domain, not to actually help the others to understand the result and to be able to build upon it. The paragraphs of English text help them to be able to claim that they are indeed the authors of some novel method (exactly what the author wants). Code/data accessibility helps others to both find errors/imperfections in their approach and to build upon their results (exactly what the author doesn't want).