Those things were almost all things that you could ignore if you weren't trying to specifically make a program for Windows, and that if you were trying to make a program specifically for Windows made it a lot easier and made the resulting program a lot better as a Windows program.

If Sun had blessed Microsoft's approach and encouraged Apple to do similar for Mac and done similar themselves for Solaris and encouraged someone to do similar for Linux then Java could have become a major language for mainstream desktop applications rivaling C/C++ or perhaps even becoming the most common language for such development.

But Sun didn't want you to be able to write for Windows or Mac or Linux using Java. They wanted you to write for the Java platform which happened to run on Windows and Mac and Linux.

And so Java desktop apps were almost always inferior to desktop apps written in C/C++/Objective C that could make better use of the native GUI and other facilities and did not stand out as some weird ugly alien thing.