We’re talking about the #resources category here. If you’re posting it on the devforum already for devforum audiences, and you already have a topic in #resources , it doesn’t make sense to create a separate Bulletin Board topic connected to that.
As above, the point of Bulletin Board is to specifically link content to www.roblox.com audiences, where you don’t otherwise have a way to share that content. For example, game/group descriptions aren’t convenient ways to share changelogs, group rules, or credits with your community members, so that’s when you use Bulletin Board and link it to them.
The About post of Bulletin Board is especially clear about the intended use: