Just so we're on the same page, I agree to the necessity for words like Hydrogen or Helium. And not gonna lie I get a kick out of using fancy words that in today's English-speaking world serve the dual purpose of implying that I'm part of the educated social elite (although I like to imagine this is not the reason why I like using them - I digress).
> but anyone capable of working out the minimally complex language needed for any given topic likely doesn't need to be told this.
This is where I (and I think Graham) disagree with you. In my opinion, this is very not easy. When I write - especially about complex topics - I feel more comfortable complicating my thoughts.
If you don't mind the anecdote, in middle and high school I thought I was hot shit because my classmates would struggle to write enough to meet the page limit and I would struggle to not go over it. As it turns out, this is not because I had more to say. It's because I would use twice the number of words to say it. But it was certainly complex prose that used fancy language - sometimes, I'd argue, parts were even well-written.
I do still think there is an aesthetic to language, but I've grown to believe that simple language possesses beauty too. I can appreciate now how famous writers like Hemingway could agonize for a day over a single sentence. Especially because I look at the four paragraphs I wrote in response and think to myself, "man I bet this is way more complicated and rambly than it needs to be."