Indeed it is, but the developers in these ecosystems created complements like Apache Arrow that will unload the data in a language-independent columnar memory f

Indeed it is, but the developers in these ecosystems created complements like Apache Arrow that will unload the data in a language-independent columnar memory format for efficient analytics in services that will run C++ on clusters of CPUs and GPUs. Even Spark has rewritten their own analytics engine in C++ recently. These were created because of the limitations of the JVM. We have tried to move the numerical processing away from C++ in the past decades but we have always failed.