[grumpydba]

> I tune C++ compilers, just like I tune Java compilers, in both cases I can decide to do it during AOT compilation or at a later moment

How many customers run self-compiled, say mysql binaries? Or mongodb? An tiny minority. Now how many tune cassandra or hadoop jvms? A big chunk.

You can use niche cases to make a point (fintech is almost the textbook definition of a niche software use case), however what you say is plain wrong most of the time.

Also, I've managed thousands of c++ and thousands of java processes. I'd take c++ ones over java any day.

[pjmlp]

Depends on how many use Gentoo, for example.

Proper Cassandra and Hadoop deployments are as niche as Fintech, the large majority could solve their problems with UNIX command line tools.

On my world the team manages deployments, I rather take Java over C++ compilation times, and having tools like Mission Control to monitor cluster performance on production servers.