If the intent was to make Remote Publishing enabled by default, the check mark to enable XML-RPC on the original Remote Publishing option section should just have been implemented. The enable/disable XML-RPC value is stored in the mySQL table anyway so whatever setting is table-driven and could be stored/retrieved from there.
Why in the world would people remove the option to enable/disable remote publishing from the options_writing.php screen?
Now people who want to secure their wordpress sites from remote publishing would have to install the disable-xmlrpc plugin???
I would rather have remote publishing DISABLED by default - since enabling it would allow SPLOGGING by other account users who would otherwise have to manually login to the site.
If it is NOT broken, do NOT fix it.