I can't speak for Andrew, but my contributions to Takahe tapered off due to work killing my motivation to code after hours. It's also been feature complete enough for how I use it for many months.

The biggest missing feature that others want is identity migration. I hacked in support to get my identity migrated to Takahe, but it's not something releasable to the general public.

Answering my own question: https://aeracode.org/2023/04/29/refactor-treat/

“I had taken two months off from developing Takahē in the run up to PyCon US; both due to pressures at work (and then, more recently, half the company being laid off around me), as well as not quite being sure what I wanted to build, exactly.”