I agree, rootless was also the main blocker when I attempted my last migration in June. My goal was to run all my Docker containers as rootless Podman containers through systemd. The first service I ported was single-container, which made it easier. Still quite some work (like manually adjusting the podman-generated unit file, tracking down some weird-looking error messages, etc), but doable. Once you get to multi-container setups, I ran into even more issues (IIRC related to the linking of containers through a network, while staying rootless), so I gave up for the moment and started a Docker daemon for the rest of the services...
