Still not great, but I cut the 20 minute Tree Language Designer tutorial demo video down to 5 minutes () from 20 thanks to Descript. Thank you @Mariano Guerra for the tip! Descript is amazing! Hope to refresh the Designer app soon and get a better tutorial done and under 2 minutes

how do you handle spaces in contiguous anyHTMLContentCells?

The language designer just handles them appropriately. So for example, your compile function might be

compile() { return this.words.join(" ") }

To the user it just works.