Ronald D. Moore is a big fan of this episode because he considers it to be very un-Star Trek; “It really appealed to me on this sort of visceral John Wayne level. There’s a monster on the ship, it’s after us, and we’re gonna hunt it down and kill it. We’re not gonna negotiate with it, we’re not gonna worry about whether it’s sentient, we’re not gonna play any of the usual Star Trek games with it. It’s just, ‘Find and kill the monster.’ There was something very pure about that show.”
To be fair, though, the Changelings and the Dominion have already been set up as a danger to the Federation, so I’m not sure their sentience or willingness to negotiate are really at issue, either.