for me, i would prefer that articles' time reference matches the date and time of the location where where it is published.
so, if Macrumors generally publishes its articles using a West Coast location, then that sounds right.
this is the standard in news and publishing. its the way we can tell who is first reporting news of merit, and we can compare macrumors and 9to5 mac and apple insider, to see who is actually doing the best job of really giving us the best coverage of apple related news.
however, forum post dates/times should always reflect my local set timezone as per its macrumors preferences setting.
i assume that is how it works right now. if not, then i think that change would be useful for people who are posting in forums.