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@TodePond Yes that's right, it can be done in client side.

There are clients I believe that do it.

The bigger problem IMO is that you don't see all replies in other people's posts. It's the same thing, with pub/sub it doesn't send you replies when you click to open a thread, it only gives those that were sent to you by pub/sub... if you don't follow a person that's not tagged you don't see their replies as well.