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Why would Java not be an ideal fit for containerization (why would any runtime not be)? Also, given you don't have to pack everything into one VM (can have many nodes, VMs, load balanced, whatever)...what makes Java particularly bad for horizontal scaling?

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Yea I don't understand the original comment... however it is true Java isn't (or at least wasn't until recently) ideal for containerization, since the JVM would not obey things like cgroup limits for memory and CPU. This was fixed in Java 9 and backported to the Java 8 (update 131) however there are still potential issues regarding CPU isolation that are not trivially solved without some explicit configuration.

For a good overview, see: https://mesosphere.com/blog/java-container/

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