One of DS9s driving themes from the pilot was deconstructing the almost militant atheism of TNG, exploring the nature of faith and how far people will go for it. A mortal man refusing the divine plan and choosing free will despite it meaning his own death and forcing them to save the Alpha Quadrant via Deus Ex Machina is totally in keeping with that theme.

In Star Trek Online the fleet shows up years later and attack the station. They weren't destroyed just relocated in time (no pun intended).

I mean, all they had to do was use a previously established device - they had the minefield in place that was preventing the fleet from comming through. Could've involved the wormhole aliens in that so that it doesn't get destroyed when they think it has. Everything would've been the same, with Sisko unknowingly going into a minefield and the aliens trying to dissuade him from killing himself in a pointless fight

That scene is a triumph of Federation ideology.

Finding the wormhole was a lucky accident, but everything else which lead to that apparent deus ex machina came about from Starfleet doing exactly what was needed to get the Prophets on their side: not with the intention or expectation of that ultimate result, but because it slotted right in with what the Federation wants to do anyway.

Sicko and his crew communicate with these strange life forms in they find, and make an effort to not only understand them but respect their wishes. They offer enormous practical support to Bajor and attempt to encourage them to join the Federation formally, but they respect the wishes of the Bajorans even when highly inconvenient (such as the abrupt pivot away from Federation membership that preceded the Dominion War). In short, Sisko and the government backing him legitimately earned the trust of both Bajor and the Prophets by being explorers, diplomats, and excellent allies. The military payoff they got is hardly the point, but they earned it.

Would any of the other races have earned the favor of the Prophets the way the Federation did? The Klingons, Romulans, and obviously the Cardassians would have taken over as brutal occupiers if they felt the need to get involved with Bajor at all. The Ferengi would have ruthlessly exploited Bajoran resources in their own way (which we know the Prophets were no fans of, see their temporary rewiring of Grand Nagus Zek), while the Borg would have simply consumed everything they found useful. Here, it's the uniquely decent actions and values of the Federation that win out.