This is an application issue, not a brokre/daemon issue. The broker will (as dbus-daemon(1)) does, deliver all signals that clients subscribe to. If they subscribe to things they don't care about, that is something that should be fixed in the clients. During the kdbus times, quite some time was spent on fixing clients to avoid too broad subscriptions exactly to fix the issue described in that blog post.

Not every page on the WWW is a blog post, nor even every WWW site a web log to have blog posts on.

My apologies, it read like a blog. Seeing the parent page I see that it is not. Either way, my comment stands.