I hadn't heard of javosize before, looks interesting, thanks. Being able to update code and data on a live system is very useful and I haven't seen that for the JVM before (BEAM of course handles that :) ).
It's surprising that the BEAM support for operations and management is very rarely mentioned. To me this is the key selling point for using BEAM vs JVM or something else.
Being able to open a remote console and do system introspection/tracing/profiling/debugging is a huge advantage when running in production. And all languages running on top of BEAM ofc get this for free.
In my experience, running JVM in production with tools like JProfiler/VisualVM/jconsole, etc. does not come close to the BEAM when trying to understand what is happening in the system.