Great read! It inspires me to write down installation cycles too, with a clear overview on the pitfalls and common problems that with installing fresh and new software.
In search for a password-less solution I have found and chosen Clef as the best solution for all the WordPress sites I have created and still administer.
This service is free up to 20thousend logins per month (!) and they made a simple to use WordPress plugin which assured a plug-n-play installation and activation.
More to come in a follow-up with a manual for installing and using Clef in a WordPress CMS environment. And hopefully a convincing dissertation on why they seem to have created a privacy secure killer solution with modern state encryption.