I may be mistaken but I think ToroDB never tried to be MongoDB replacement but rather something you use as MongoDB replica to get your data in PostgreSQL so you can query it with SQL for analytical projects ?
* ToroDB Stampede[1]: MongoDB replica, converting on-the-fly documents to relational structures. Targeting OLAP, as data normalization made queries from some % faster to 2-3 orders of magnitude faster.
* ToroDB Server[2]: what DocumentDB is or FerretDB is planning to be. It was less developed than Stampede, certainly.
[1]: https://github.com/torodb/stampede/
[2]: https://github.com/torodb/server
(edit: formatting)