I understand, most probably do. But if one is engaging with the game in a way that one considers fun, one will extol it's virtues & encourage others to try.
Particularly if people give reasons for not doing it that are able to be overcome fairly easily.
Playing in Open is entirely optional, as is any direct interaction with other players other than the BGS. So if someone (even a lurker) has the view that they would like to meet more people in the game but X, Y, Z, then those that already found ways to overcome those hurdles will offer their tips in the hope that more will be willing to add more interaction (positive and negative, you gotta be prepared for both in Open).
If someone is happy where they are (in a PvE group, or solo or whatever) then the hotel california style topics are only relevant if someone proposes removing features from groups & solo. I would play an open only game now, because I know it's not as scary as it initially appears. I probably wouldn't have bought the game without some way to practice in peace though, so an open only BGS style of game would suit me. I appreciate it wouldn't suit everyone.
From previous conversations I think you & I play in a very similar way, it's just that I play in Open. You could too if you wanted to, and meet benign players like me (and others that fear you, and yet others that are openly hostile to you). You don't have to, and you shouldn't be forced to but imo you are missing out, particularly as an experienced player who no longer finds NPCs all that challenging. Other players provide much more opportunity for interaction than NPCs.