Because webforms don't get added into blasted posts, adding a "read more" to any post that has a form, even if the body is "Fully" displayed in the e-mail, will help users find out how to get through to the form. Otherwise, situations like the attached example can happen, where "Fill out the form below to register" just doesn't work or make sense, and the user gets stuck. I have seen this happen a few times.
That's a great point, Rachael! Videos should trigger the read more or forward along their thumbnail to be clicked on. I'll be sure that gets added to the request.