https://www.joomla.org/announcements/release-news/5699-the-next-version-of-joomla-is-just-around-the-corner.html
New Router - We are currently facing some issues with the new router if enabled on some production sites. We are working to fix them in order to provide the quality expected by our users. As such, we are unable to guarantee the inclusion of this feature in the 3.7 release at this time. Please rest assured that we are working hard to ensure it will be available as soon as possible.
https://github.com/Hackwar/jlrouter/releases
On vous conseille de tester mais d'éviter de l'utiliser sur des sites en production.
Désormais, il faudra patienter et espérer son intégration dans les prochaines versions (Joomla 3.8, 4 ?)
N'hésitez pas à partager votre avis.