That a larger "membership" would result in a higher probability of encountering another player is not contested. I responded to "instances tolerating larger numbers of players".
I suppose I mispoke. I'm thinking in terms of server traffic with similar pings in similar regions. My understanding is that a PG could very well be spread across multiple continents. Even though even though you're in the same pg, you would be very unlikely to be instanced with them. If you're in open though, there are more players with similar network profiles you would likely see.
For example, there might be a Mobius player in Australia, and one in Germany, they probably will never see one another even though they are in the same pg.
Last edited: