Honestly I don't get this, even the low pop servers have a functioning server AH it's not like you don't have people posting things. The mythic thing I understand but I don't see that being a huge selling point. Also as a one off I totally would play a WoW server where I could do everything solo with the appropriate amount of effort.
Only with warmode on, and even then this isn't totally true, you can be on a full server where you still have one side with super gank teams around at all times.
Options are always good, but sometimes somewhat being forced to put down roots can also help. You are more likely to make friends when you can't just be a prick to everyone with the only drawback being you just join another of the 50 options...
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I mean I don't want to outright say no your wrong but... In my experience the larger the group the less personality it has. everyone on a low pop sever knows who the people you make fun of for peddling trash in /2 are, high pop you're going to have to many to effectively pick on
. Likewise In a smaller sever almost everyone with a history on it knows the 1-2 main guilds within that have existed since Vanilla, and they can probably tell you the drama of them as well. You are much less likely to know everything about all the guilds when you have x20 the amount of them to keep tabs on...