Please, Balancing Team.
You recently started to apply some community's opinions, but I also think that it is necessary that you do not only read the titles of the posts, you also should read the answers to them; as well as use your own logic (For example, if you apply all of those "holosmith nerfs options" in most of the posts, you going to make a useless core engi with beautiul animations)
Literally there were like two post saying that "Poison is better than stealth reveal", and most of replies were "No, it's not".
I think those people who said things like that are casual PvErs(because hardcore players don't even use Scrapper xD) or some casual WvW Roamers (Because hardcore Roaming players don't even use Scrapper xD) or maybe some casual PvP players (Because hardcore players don't even use Scrapper xD)
So, why the update note says "The community said that they prefer Posion area instead of reveal".
One of the interesting WvW Zerg Scrapper's mechanics was that he is his own counter in one of his support skills; putting the reveal in a useless zerg skill is like remove it.
If you going to remove it in the Scrapper, at least add a similar skill in another zerg meta class.
In my opinion, you're doing a horrible work with the engineer class in general. Necromancer and Engineer are a DISASTER in this game, and you are making it worse with each "balancing patch"
1-Scrapper - Dead class that only works in 1 Game Mode, and it isn't even so good if you compare it with the support firebrand (Only the Stealth holds it in meta)
2-Holosmith - Probly your biggest disaster, useless class in WvW and PvE (Sadly it was good, but for some reason that nobody knows, they decided to kill him, and no, Holosmith isn't a option in serious raids/fractals groups with options like DH, Darevil, Chronomancer) and broken in PvP.
3-Core - Useless in all game modes (Yeah, condi engi is useless; hard rotation without rewards; with options like Mirage, renegade and Firebrand)
I don't know why, but I think that you're killing this class because the engineer is the least popular class (For example, when Scrapper was strong in PvP, there were a lot of people crying about it; and you nerf it instantly and almost killed it. But when classes like Warrior and mirage were broken, you nerfed it like 5 months later, but they at least still as a meta option).
With the necromancer, I really don't know, because this is a popular class; I think your problem here is your inability to think or see how to work with him)