[pjmlp]

Only by those that don't have experience in Java tooling.

High startup costs you say? Then don't use OpenJDK.

Get an AOT compiler to native code like Excelsior Jet or switch to a JVM that supports both AOT compilation to native code and JIT code caching like IBM J9 or Azul.

class scanning ? Again stop using OpenJDK and switch to a JVM that supports class sharing across VM instances like IBM J9.

For those that don't want ever to use anything other than OpenJDK, some of those features might eventually come there, like the newly introduced support for AOT compilation of the base module for Linux x64. With everything else planned for Java 10.

Bloated libraries? Well, there are bloated libraries in any programming language.

And by any change you are thinking of JEE, I doubt you had the pleasure to use C or C++ alongside DCOM, CORBA and SUN RPC, at enterprise level to fully understand the relief it was to change to JEE.