Also remarkably, it is only the Axis of Alpha ships that die in new and flamboyant ways: any ship built or enhanced by the Dominion still stays intact when fired upon, or disappears in a classic fireball. So we could very logically claim that Dominion weapons are a new thing that pierces shields with ease and causes the more exciting type of destruction, and nothing else has changed much.
In Alpha-to-Alpha fights such as "Way of the Warrior", the lack of visible shield bubbles doesn't create obvious contradictions. It still takes an enjoyable fireworks show of four torpedoes to gut a Klingon battle cruiser, even if the powerful phaser beams of the station are the first to demonstrate the ability to kill a small BoP with one shot. (And that really is a small
BoP - among the smallest in Trek history, at least in the shot where these fly in formation with a Vor'Cha