I've been managing my containers using the older mechanism (systemd-generate) since I started and it's great. You get the reliable service start of systemd and its management interface. Monitoring is consistent with all your other services and you have your logs in exactly one location.
I really wouldn't want a separate interface or service manager just because I'm running containers.
Most VMs only run containers, but I have supporting services on every host as well. Stuff like the mesh VPN, monitoring agent or firewall.
If I want a quick overview, a quick
systemctl status
will tell me everything I need to know.