They offered O’Brien a spot, but he was too busy hunting voles to have his picture taken

O’Brien was more likely to do other/more-creative things. Reversing the polarity was but ONE tool his his belt. The others, it was almost the full belt.

O’Brien is on another level above these four listed … Starfleet would be better off encasing his brain in a super computer and run every ship remotely

The four commissioned officer* horsemen of reversing polarity

I feel like the space station needed its polarity reversed a lot less often than the starships did.