Comment # 59 on bug 900558 from Michael Chang

Sorry, but I'm still confused, could someone help me to understand the current
definition of "ro" command line option to be used by dracut ?

Is it ignored ? If so why keeping it harmful ? I would like to keep the
existing config unchanged in this case.

Is it now following the dracut.cmdline man page, In which case grub2 must
remove the ro option to prevent to ro root occur.

 http://man7.org/linux/man-pages/man7/dracut.cmdline.7.html

 ro
    force mounting / and /usr (if it is a separate device) read-only.
    If none of ro and rw is present, both are mounted according to
    /etc/fstab."

Is it something else ?
Thanks.