Sacha Chua is busy with family and life. I appreciate that she still puts out a weekly Emacs News post.
The other two, unless you follow them on Reddit and GitHub, you’d be worried that they were trapped under something heavy.
The stuff all of these folks posted are still valuable and enrich the Emacs and Org-Mode community. I think it would be better if they were still writing on a regular basis. But, you know, life and work and family and stuff happen.
I, for one, look forward to their return.