Java and .NET have mature decompilers. Obfuscators or minifiers replace meaningful symbol names with gibberish. Meanwhile in natively compiled applications that information never existed in the first place unless it was explicitly added into the symbol table and not removed.

If you want to obfuscate your codebase then write your software in Delphi. The native code it outputs will drive any reverse engineer insane even though there was no attempt at obfuscation...