I am now ditching the invite only mode for the newsletter. I feel confident that I have a form for it that I like, and so I would appreciate more readers and think I will learn more from a broader readership.
I have now written 20 issues of the letter and I think the form is slowly evolving to where I want it to be, so now it is also mature enough to show the world. Looking forward to comments and ideas from anyone who wants to join.