the formation summons were time consuming, extremely *extremely* bad statblocks, rather large compared to a small coin, couldn't phase, had to have set up, and (if we have RME) they were also slow as mundane mortals. B rank speed is quite quick, and those below our cultivation that don't rely on speed will likely be unable to catch them. If they're spiritual ranged attacks cannot phase through solid objects, these will actually be decently able to escape a strike once detected.
if you're saying the scrying might end up like the formations, I don't think so. The set up is less intense, the rewards much more tangible, the range much more extreme, and frankly when we end up having to take care of huge tracts of land this kind of scrying will be invaluable