The structuring of essays improves and dips in transcendent quality over time depending on the behaviour of authors at large and human understanding of communication through essay. The virtue and successful execution of well structured essays is timeless. RD's work is well structured. It's possible to learn and execute on structures that are proven to work across time and speak for themselves in the results.
Could be that tech bias. I've been coding awhile, and '+' reads as 'ADD', for inclusion, while '&' reads as 'logical AND', for restrictive subsetting. The '&' no longer sits right. (Plus, it's a shell and HTML metacharacter, thus it's a potential potent piece of trouble in casual typing and so something to be avoided.)
> I believe the formula I've given you, importance + novelty + correctness + strength, is the recipe for a good essay.
I wouldn't say he's really using "+" instead of "&". "importance & novelty & correctness & strength" doesn't provide the same feeling of adding, of mixing, to get a formula.
Good writing is timeless, I may suggest that adding hyperlinks under a new word you introduced inside your essay that requires clicking on and reading a wholly different story to understand the current story you are reading, is a terribly under-performant way of communicating information inside an essay to the reader.
When did using "+" instead of "&" become acceptable in proper English? I understand this is a tech blog and I have no problem with "+" used in a tech context, the use in a virtue signalling piece on the rules of writing a good essay seems misplaced.