If you’re going to invent a made up technology, it should be one that increases the cool factor (things like “warp drives”, spaceships, cyborgs, whatever) or or leads to interesting plot points or dilemmas (like time travel, but that’s pretty overplayed as well). At least Stargate has a cool looking portal, but as far as I can remember, all it does is take them somewhere, and it doesn’t even look cool when they arrive. Like Star Trek but without the cool spaceships.

Nah man. Portals don’t have hyper competent, 11D aliens that are actually a bit entitled. Do portals let you just erase your enemies?

Unless you subscribe to the theory that it was just Sisko using 3% of his real power and glared the Jem’Hadar or of existence, in which case the wormhole was incidental.