So much this. I reached the point where I started assuming every DF party I ever was in would be made up of people only from different servers, so I stopped trying to friendlist them. Tonight, during a run in the Sunken Temple, I did a double take when 2 of them ended up being from Ultima as well. We all got along great, the run went very well, and at the end our BLM was saying she was sad she couldn't add any of us afterwards. I said the same thing, and then the healer laughed at me about how the BLM was the ONLY one not from Ultima in there.

Rambling story short -- lots of people you find on DF are meh. But there are lots that have been awesome, and it sucks to see them disappear into the ether as soon as a dungeon is over just because I'm on Ultima and they're on Tonberry. Cross server friends list would be utterly amazing.