Although I'd like to see this implemented, I can think of several reasons why this is a bad idea. Merit sources for instance would overlook newly made good posts.
If it's optional/opt-in then it could still work. Merit sources can switch to regular sort order if they want to see all posts.
That must have been before I joined. If it was removed because it can easily be abused to target specific users, it might be possible again if the "ignore power" depends on earned Merit.
Same with this. It could work just fine if it's opt-in. It would still display all the garbage to Google and whatnot, but users who are tired of the useless noise could save time by skipping it over.
Maybe even a demerit/bullshit feature could work this way: not shown publicly (somewhat like bump scores) but if a post accumulates a certain amount then opted-in users could see a warning that it is likely bullshit.