Just a couple of observations.
This is an interesting thread title. It's a discussion thread, without a clear discussion direction. (Not a criticism; just an observation.)
I don't post very much anymore. My thread would be really dull because I don't have kids, don't like to talk about my work or hobby and H has vanished. So life would be summed up as "Work, ride, eat, sleep, repeat." B-O-R-I-N-G.
But I do still read a fair amount, and I would also say that there have been some changes to 'the way things used to be' on HS. My 2 cents, for what it's worth, is not so much that the topics have changed, or what can or cannot be said has changed, or the focus on standing or not has changed.
My perception of what has changed is the filter through which posters receive each other. My sense is that posters are quicker to perceive a comment as negative. That there is a little less room for grace. That differences of view become positional and personal - sometimes very quickly.
It might be because this is now a community where many have been here quite a while and think they know each other enough to assume what someone will do next. Old arguments get hashed and rehashed, and the gems of diverse experience and opinions (because that's mostly what is on offer) get lost in personality skirmishes. It's one of the sadder aspects of human nature.( And it's only my perception, so others will see things differently.)
ANYway, getting back to the subject at hand.
I don't think there's been any implicit or explicit direction not to talk (or trash talk) the OW/OM so much as there has been encouragement to think upon why one might need to?
In some cases, it is because the OP is in one's face. In many cases, probably most, it's because it is easier to feel anger toward the OP than the MLCer because our feelings are less conflicted about the OP.
I think others on this thread have said it well. Realize that putting the focus on the OW/OM.....puts the focus on the OW/OM. Is that where you want your focus to be?
No doubt, it is helpful to have a healthy outlet for unprocessed feelings toward the OP. Just stay aware that what one feeds is what grows. Anger may not be what one wants to feed, because anger can turn us on each other, too.
For me, venting rarely makes me feel completely better. Yes, it releases the pressure. But the need to process whatever the underlying emotion is is still usually still there, waiting to catch me the next time. For me, I find it better not to give them much attention at all -- which is SO very much easier with a vanisher.