There are some very valid points being made here. As @stefanos82 says, CP is all about “stability, robustness, and security” - and also familiarity.
Core development and ecosystem development go hand-in-hand. One needs the other and that seems to be a concept that has escaped the folks over at WP. As @ozfiddler rightly points out, some great progress has been made in the plugin development area. And yes, there are firms plans to fork CF7 to become “Classic Form”.
One area I’m less happy about is themes and one of the goals I’d like to see for 2021 (which I will add here 2021 Goals/Projects - #2 by james when I’ve had more chance to think about it) is the development of a CP-specific theme that ships with the core (a CP version of Twenty Twenty-One if you like….only, much better). If anyone is interested in taking this on, please get in touch with @james or me.
The last point I would add is that it should always be remembered that CP is run entirely by volunteers, most (if not all) of whom also have busy day jobs.