The 'document' part also seems to be insanely hit-or-miss from my amateur experience. Self-documenting design/code is... well, not. Auto-generated documentation is also usually just as bad IMO. Producing good documentation really is a skill in and of itself.

Also small personal opinion: If your abstraction layers or algorithms are based off a technical concept, you should probably attribute that concept and provide links to further research, to eliminate future ambiguity or in case your reader lacks that background. Future you will probably thank you and anyone like me who immediately gets lost in jargon soup will also be thankful.