The Odyssey and Ent-D were hit with writer's nerf in order to make a point about how threatening an enemy was and or to see something cool happen on screen.
The Odyssey was meant to be an Ent-D stand in. Right down to the Picard-eske captain, Keogh. Ira Stephen Behr was demonstrating even the Ent-D would have been destroyed in an encounter with the Jem Ha'dar. Plus, not much you can do with a large starship doing a kamikaze run on a vulnerable section of the ship.
With the Ent-D's destruction, that was Brannon Braga's idea. Crashing the Ent-D on a planet was something he wanted to do for the finale of TNG season 6, and then the opening episodes of TNG season 7, they would get the Ent-E. However, it was just going to be another Galaxy Class. With the movie coming down the pipeline, TPTB decided to save the idea. However, GEN was beset by the various producers and writers (Berman, Braga, Moore and Taylor) putting the cart before the horse, with regard to their story. With regard to the Ent-D's destruction, the "cart" was seeing a saucer section crash on the planet. The "horse" was supposed to be a 3 against 1 fight with Klingon BOPs. However, they reduced it down to 1 BOP, nerfed the Ent-D (which a full weapons assault would've annihilated the 20 year old BOP) by having it only fire 1 phaser array and launch 1 torpedo (when Riker asked for a spread), and had the crew not rotate shield modulation when they discovered their shield's frequencies had been penetrated. This results in the crew technobabbling a solution to win a fight they didn't need to cheat to win. Then, Geordi couldn't manually eject the core prior to it's detonation.
Funny thing is, when Braga and Taylor would become the head honchos on VOY, the shield moderation would be compromised by an enemy and the crew would rotate the frequencies without incident. Also, I can't remember the episode, but I do recall B'Elanna manually ejecting the core, and then the crew going back an reinstalling it without incident. Not to mention the Ent-D crew had no trouble rotating frequencies and firing all weapon during the show (against the Borg) and Georgi could always handle warp core breaches when they were on TV.
It's nerf, or nothing!