Yeah, I totally agree. Speaking of networking, I really love the plug and play nature of LXC/LXD around networking, which has enabled me to do a lot of interest

Yeah, I totally agree. Speaking of networking, I really love the plug and play nature of LXC/LXD around networking, which has enabled me to do a lot of interesting things in conjunction with virtual Ethernet bridges and veth devices along with OpenVPN and netem for latency simulation. In particular I was able to simulate a really big network of devices (on their own private "LAN") across a few simple desktop PCs, by attaching each container to one or more bridges and then on the host joining the bridges across systems using OpenVPN TAP devices. I was able to simulate a full blown network and test some attack scenarios and better understand some of the network dynamics. This isn't something that's a huge use-case applicable everywhere, but man the flexibility is super super handy, and I haven't seen many tools out there provide the same amount of possibilities LXC does (like all of the a la carte cgroups functionality).