I haven’t had issues with rootless networking but I run pretty simple apps. I gave up on podman-compose though and run individual commands to create podman objects. Once rootless containers are in the same pod you can access other containers in the same pod over localhost
Went kayaking in Lake Powell last year. Locals were saying the lake was down 30 feet (!!) from the past couple of years. I have no idea if that sort of fluctuation is common but that was enough to make me feel very concerned about the water situation in the southwest
edit: they can be found here https://quay.io/organization/hummingbird and more documentation is located here https://gitlab.com/redhat/hummingbird/containers