You are preaching to someone who hasn't really liked DS9 since Worf joined the cast.
And no, I didn't care for the cheat that was Sisko inserted into "Mirror, Mirror" and pretending it was the Tribbles episode. I guess they counted on most viewers not noticing.
Who said all the clips had to be from TROUBLE WITH TRIBBLES? DS9 Production people never said that. They never said all the scenes we used in this episode are from TwT. I don't see a problem with it since they wanted to add the Sisko/Kirk scene.
I don't recall Paramount pretending that the Sisko/Kirk scene used footage from "The Trouble with Tribbles", Paramount can't be held responsible if viewers assumed all scenes featuring the two cast where from one episode.