Niantic is rolling out the Nearby feature in some more cities besides San Francisco, so instead of seeing up to 9 Pokémon, you see some selected Pokémon near the Pokéstops nearby, but only 3 Pokémon in the Sightings tab.
Example screenshot I found online:
In some cases, in the top 6 slots, I have seen multiple Tentacool at somewhat far away Pokéstops (in some cases, up to 2km away), even though Tentacool is a Pokémon I may not even catch if it were to pop up on my screen.
Thus, there are only 3 spots left for the wild Pokémon. If there is a Lapras or Snorlax, couldn’t the fact that there are only three spots prevent the Lapras or Snorlax from showing up? (For instance, it might be showing Paras, Rattata, and Weedle with only three spots available but randomly assigned).
In fact, it might even be worse if I am hunting for a Snorlax I see in one of those three spots, but then a Paras (or something) comes into range of me and replaces Snorlax in my Sightings, making the Snorlax disappear from screen as if I’d walked further away from it, even though I did not.
Also, if this new feature really can prevent a Snorlax or Lapras (or Dratini) from being found, is there a way at all to disable this new “Nearby” feature? I might have to travel to a different city to play, which would make it more troublesome to play than it used to be.