This should be obvious to AVC readers but I am a fan of short and sweet. Why take two pages to say something you can say in one page? Why take two paragraphs to say something you can say in one paragraph?
This letter to potential investors from the CEO in the Duolingo S-1, which was flipped to the public yesterday, is a fantastic example of that.
Disclosure: USV is an investor in Duolingo and we stand to profit from their IPO. This is not in any way an endorsement of the offering. Investors should read the S-1 and make up their own mind about it.