Hi, Friendly neighborhood Nav stack maintainer here.
I’ve started a discussion analog to the default SLAM discussion regarding localization techniques to support in ROS2 navigation for the foreseeable future. AMCL is not awesome, and I think many folks would like to see it die. Here’s your chance to make your thoughts known! If you have other non-MCL localization techniques you’d like to throw out, I’d love to hear them and any links to existing implementations that might exist (not required). See discussion below in link and comments to follow.