The assumption in this that doesn’t fit my experience is that it assumes that someone that writes unreadable code abstracted over dozens of files, is going to be able to write clear, expressive and complete documentation.

In my experience if they can do the latter the former isn’t a problem. But since many people can’t you are left with bad code, littered with bad (often contradictory) comments which makes the problem worse not better.

> I’m sick of people escaping writing documentation

First level of documentation would be specifications. Which can then be used to write tests.

But in many, many shops "Agile" means "we don't do specs anymore, woohoo!".

> But the hard truth I learnt is that most people are saying this because they aren’t capable of verbalizing what they are programming.

I completely agree with you, ie right now doing bunch of data migration code that is awful 200 lines on first look, but does quite clever transformations, handles various data corner cases, manages lots of threads, is already quite optimized (had 30x speed increase just over last week's state and not yet done with it) etc. and... is full of little green one-liners explaining why certain logic is happening, why at given place, and not elsewhere, and how it helps later in the code.

Its even one-off migration, and its mostly for me only. But I still put comments in, have enough experience to know I will keep using those comments in further optimizations, and I know by heart that many one-off efforts end up being re-used later. Code dense with logic shouldn't require you to re-read it all to have constant full mental model of it and all its branching and possibilities just because you want to tweak it a bit.

The important point is to evolve those comments with code, otherwise they become worse than no comments at all. This is where most folks hit the wall - they are simply too lazy or undisciplined for that.

> They almost convinced me somewhere in my career. But the hard truth I learnt is that most people are saying this because they aren’t capable of verbalizing what they are programming.

I'd say that's true, and it's worth noting at this point that expressing certain things in natural language is hard. The strict rules of programming languages mean that you can reason about programs to a complexity level that would otherwise be unreachable. Notation as a tool of thought. The corollary is that there may not be a simple natural language equivalent of the code you're writing, and that adding documentation might be more effort than it's worth.

Not writing docs is a sort of hazing. Also job security.