While I think this is good advice, I do think one can make the given writing more accessible by adding small details, like expanding acronyms the first time you use them. Or providing a link to introductory reading for a given topic, or just explain yourself. I've found that sometimes I was being too terse when describing something, and it made it hard for everyone to understand, not just beginners. But it took my less-technically-inclined friends to point it out because they were unable to understand it at all, as opposed to those who could understand it a little.