I know what you're talking about
but the road map threads aren't as toxic as the rest of the official forum.
You don't necessarily have to hold the other posters into account, just post what you want in the specific thread and maybe the developers will notice your suggestion amidst the rubble and evil snarks.
In a sense it offers much more overview (for the developers then) than what any new thread in one of the other forum sections could hope to achieve. The only pity is that not every important subject is listed in the road map even though the developers are working on more stuff than just the road map features.
It's like SOE has posted up a restaurant menu but players can still offer advice about which sauce or drink that should go with it. And whether they like the dessert first...