Actually, the worst thing that can happen is using a mega server which utilizes phasing tech (especially sharding) - Blizzard’s implementation, of which, has ruined the social community in the modern version of WoW. Today you don’t need to talk to a soul to play what’s supposed to be a “Massively Multiplayer” game.
Phasing technology (i.e., Quest phasing, Cross-Realm Zones and sharding) solved a technical problem at a huge social cost. It destroyed individual community, which still existed even on low pop realms because each individual realm is like a home town community.
In Classic, saying I’m from Eonar was like saying, “Hey, I’m from Bozeman, Montana!” Today, saying I’m from Eonar is almost pointless - it’s like saying “I’m from North America.” Who cares about that? I don’t and no one cares about me since I’m essentially part of a giant North America mega server now.
In Classic, if people didn’t like low pop realms, they could transfer to other more populated realms. And, moreover, people in high pop realms could take a free transfer to a lower pop realm - that was the Vanilla solution and should therefore be the default solution.
The reason for this project is to restore the experience of authentic Vanilla WoW - primarily for the community it once had on individual realms.
Sharding specifically, since it is the only phasing tech that could be used, is an existential threat to the community spirit of Classic WoW. If sharding is used, no one will care about me and I won’t care about you - just like Live current WoW (BFA) today.
Mark Kern, the former Team Lead on Vanilla World of Warcraft, said individual realms are very important to fostering community and were a key design decision by Allen Adham, the original Founder of Blizzard and Lead Designer of Vanilla World of Warcraft:
Allen Adham wanted communities. “Everybody knows your name” like Cheers.
– Source: ClassiCast#13 Interview with Mark Kern on YouTube (41:20) youtube dot com/watch?v=izCBaGfGJCg
Patrick Magruder, Lead Gameplay Engineer on Vanilla World of Warcraft, stated how significant realms were when he said:
“When WoW first came out, it was 100% ‘What server were you on?’ was everything.”
— Source: Blizzard Explains the Entire History of World if Warcraft - WIRED YouTube Channel (min. 5:25) youtube dot com/watch?v=vvrzZgZ2ZDw
J. Allen Brack, now Blizzard CEO, said he understands how important the authentic Vanilla experience is for this community and phasing is not something we want want.
CRBGs aside - which were part of Vanilla - player phasing technology kills the
authentic gameplay I’m looking for from Vanilla World of Warcraft.
Brack is clear that using modern server architecture doesn’t mean that these Classic servers will have the same features that current World of Warcraft does. There won’t be cross-realm servers or Looking For Raid and Dungeon Finder automatic party matchmaking. There’s still a lot of questions about how the team will tackle it, but Brack says they’re committed to recreating an authentic Vanilla World of Warcraft experience. “One of the tenets of Classic WoW is none of the cross-server realms and different [server] sharding options that we have available to us today. There’s a lot of desire on part of the community that this is something that they don’t want.”
– Source PC Gamer: pcgamer dot com/this-is-how-blizzard-plans-to-finally-bring-back-vanilla-wow-servers/