In theory, it isn't that difficult, in practice writing _accessible_ text takes a lot of practice and feedback. Letting go of your own biases towards base levels (curse of knowledge) is something that already trips most people and what people find really difficult to overcome.

Which is why the statement you are responding to is often more true than you might realize. Because these people have had a lot more practice in that specific area. Although not all of them, that would be a generalization in itself.

I help run a writer's symposium, and let me tell you it's really hard to write a good novel.

We get editors all the time talking about things they commonly see done badly in submissions.

Slush pile readers (the people reading unsolicited submitted manuscripts) have so many war stories about awful writing.

The books you see on the shelves are less than 1% of what's created and even then there are ones that get through that are bad.

Now we have amazon inundated with AI generated books that are just incoherent.

And that is creative writing that strives only to be entertaining. Tech writing tries to teach you how to do something, which is much harder.

I like watching maker videos, and even the ones trying to explain how they are doing something always skip over important steps.