Difference between 5.9 vs 5.7

Hi everybody,
I had worked with release 5.7 without any issue last year but now that I
installed 5.9 on my new Notebook(with intel graphic), it mixup me!
1. Why the command of "xorg -configure" did not create xorg.conf.new?
2. I installed xfce4 by "pkg_add xfce" successfully but still Error me this:

/home/user/.xinitrc[2]: startxfce4: not found
xinit: connection to X server lost

Thanks in advance.
Regards.