Thread subject says it all
You have the Preview HTML option and you can also design the newsletter in any program (Frontpage, Dreamweaver) and then just copy-paste the code.
A WYSIWYG will online eat resources and in my experience are never 100% WYSIWYG
I don’t want to have to involve anther program to use simple html markup. There are simple wysiwyg editors out there that don’t take a lot of resources.
I agree, and at this point in the game they probably spend more time explaining how to work around it’s absence than it would take to just implement something.