@cyberczar As mentioned, I agree that your reply _should_ show up in the full conversation context, at least on the group instance's timeline for the group.
But unless you can recommend a strict ruleset that would allow me to receive content to my homeline using the method you described, without having to get it bumped up for _every_ new post (from people I don't otherwise subscribe to), I'll stick with my personal conviction that bangtags should be used only when the specific post it's attached to would be of interest to the _whole_ group. And will likely block people from my timeline (and possibly groups I administrate) where excessive bangtagging is used :)
It's just that I want to avoid doing that and thus I ask nicely that we can harmonise our behaviour :]