This happened at DS9!
When I first saw Picard and Crusher walk into the Promenade, I was expecting more interaction with the DS9 cast.
It didn't happen.
Oh, we did get Alexander Siddig El Fadil onto the Enterprise, but there would have been:
Picard arguing with "The Sisko" about Aqueducts
Worf and Odo catching Quark in some crooked "enterprise"
Riker getting Fleeced by Quark and Rom the first time he ever plays Dabo...
And Howlin Mad Broccoli screwing up the Holosuites, he gets trapped in one with Geordi.
That's what could have happened.
I really don't know why there were not more Crossover eps like this, of course the first DS9 ep was a crossover, involving Picard, O'Brien, and The Sisko.
But there was a real opportunity here, to totally merge the casts of both shows. I have always wondered why it never happened. It could have even happened in the TNG Movies, while DS9 was still on the air.
But all we got was this meager episode.
As an episode, important things happen for Data and Worf and Data did get to spend time with Bashir. Even though Bashir forgot to put his shoes back on for his last walk down the Corridor.
Within the parallel Data/Worf stories there is an internal continuity. The Data story is rather interesting, but the Worf story, that's another missed opportunity.
And of course this is one of James Cromwell's 3 TNG Appearances, this time, well, see if you can guess who he is? It took me a few viewings for me to figure out who he was in this.
Look also for Tom Paris' "father" Richard Herd. And Harry Kim's fiance from "Non Sequitur".
It's not that this pair of episodes were not good, But a huge missed opportunity: TNG and DS9 were the most watched shows from this time period, they could have done so much with this.