In my ideal situation, if I write a function, it's immediately usable wherever I want. As long as it's fast, reliable, scalable, inexpensive and all that jazz,

In my ideal situation, if I write a function, it's immediately usable wherever I want. As long as it's fast, reliable, scalable, inexpensive and all that jazz, I don't want to think about support infrastructure. Doing the infrastructure yourself has no benefit if it's done right - it's not the end goal. So server-less is closest to that ideal. Containers are better than VMs because they are faster and lighter weight. So much so, that people develop new ways of working that would be cumbersome with VMs.