wagtail is really not ready for prime time, maybe by design. in some respects its easier to use the django admin...
WordPress may be a bit directly comparable to https://www.coderedcorp.com/cms/
It's just a few extensions on Wagtail that let you get started with common page models for blogging and generic websites out of the box.
I often think of Wagtail as a framework for building your CMS, where as WordPress is a pre-built CMS.
Disclaimer: I'm on the Wagtail core team.
On top of that (assuming that extra investment is possible / desirable) the abstractions layered on top of django are quite opaque and have a steep learning curve. Having to code standard CMS functionalities becomes an eye-rolling exercise.
You only said you thought it wasn't ready for prime time, which I think a reasonable interpretation is that you were saying you didn't think it was ready for production use.
> Would bet that none of those production deployments are without some non-negligible developer time investment.
That's the thing, I think the time invested is pretty negligible. Especially when compared to maintaining wordpress and having to deal with plugin craziness.
> Having to code standard CMS functionalities becomes an eye-rolling exercise.
You only really have to setup models for pages, tags, categories etc, after that the editor is incredibly functional.