Added 6 minutes later
I won't change anything, but I'll say it anyway. The Spider map is very conducive to interaction - meetings usually happen on the first turn, and in my opinion, it doesn't fit the ideology of HL+U. Nostalgia, on the other hand, does fit and even encourages it - meetings on the third turn are normal there. That's why it's not played much, but it's a good reason to include it in the list, at least.