If by "only the simplest of topologies" you mean: 4 physical interfaces, bonded with active/backup failover and mii-monitoring, and 20 VLANs, turning off IPv6 o

If by "only the simplest of topologies" you mean: 4 physical interfaces, bonded with active/backup failover and mii-monitoring, and 20 VLANs, turning off IPv6 on my public interface... Honestly, I really like netplan, been using it for all my systems for ~5 years now.