I am not familiar with them, but a quick Google seems to suggest they won’t work with WPEngine, Wordpress.com, etc. In any event, they’re bolt on solutions, but the core of Wordpress is still a mess of configuration split between files on disk and the database. There is nothing so valuable about Wordpress that you couldn’t just get a more reliable solution from scratch than by bolting more stuff onto WP. I’ve heard people say “oh, our users are already trained on WP, so it’s a good CMS” but I don’t buy that at all. I’ve had users praise my homegrown CMSes before. There’s not much difficulty in pairing a WYSIWYG text editor and some form fields with modern web stacks these days.

> “oh, our users are already trained on WP, so it’s a good CMS” but I don’t buy that at all. I’ve had users praise my homegrown CMSes before. There’s not much difficulty in pairing a WYSIWYG text editor and some form fields with modern web stacks these days.

I don't think even the admin UI is well organised or consistent though. Most users just know how to create and edit posts. Once you start installing a few required plugins too, the UI becomes even more a mess of controls that users are scared to touch.