Actually my primary concern about Classic servers is that all static servers degenerate over time as users discover exploits and degenerative metas which become more and more abused. #nochanges people will fight any attempts to enforce an environment that was more like the original game, and they will have a legitimate argument so it's not easy to dismiss. I've been a developer for an EQ emu for the last 5.5 years, so I understand this well.
Some examples: (I could provide many)
Al'Kabor/EQMac was stuck in PoP for 10 years and developers abandoned it. What happened there? Nobody killed Vex Thal trash because they abused an exploit that allowed them to get targets for mages across the zone which they parked half a dozen of in the zone to summon the raid to each boss. The zone was essentially ruined. Behavior that would have been disallowed in 2002 had developers noticed it, but the exploit was not well known in 2002.
Then there was pet pulling, which allowed people to use low level pets to single pull anything in the game. We had that in for awhile on our emu, and the result was people pet pulling every goddamn mob in the game (fire giants, lguk named, kithicor DEs etc) which fundamentally broke a core aspect of the game. Sony developers didn't fix this at the time because it wasn't abused anywhere near the level it was on our emu, but they certainly would have if it was. (it was fixed after our era) So by demanding zero changes, #nochanges people are demanding a gameplay experience unlike the original.
Now as for WoW, I saw a YouTube video yesterday which discussed the Blizzard AV post, and it mentioned that AV was the highest honor farm for ranking. This was the exact opposite of my experience with the game in 2005: I was #1 on my server until BGs launched (I won the tabard) then my rank tanked because I did nothing but AVs. The reply I got was this:
in private servers they do AV premades and still finish the game in 20 mins.( 14 mins is my record) Even with all the elites, the mines, the shreders and everything. we're talking about insane amount of honor with this way. If AV turns to a turtle, u afk and u take 15 min break. But generally speaking, turtlers getting shit on by their faction cus noone wants a turtle game. They are rankers and all they want is the maximum honor per hour.
That is badly deteriorated gameplay. Players abusing how the honor mechanics work by throwing games and ruining the experience for themselves and everybody else in the BG. It's Blizzard's fault for making such an abuseable system, but if you #nochanges the server, then it's going to end up being something unlike what we experienced in 2005-2006. WoW is less a sandbox than EQ was so it's not as severe there, but PvP ranking will probably end up quite different and AV could potentially be ruined.
Incidentally my Preform AV Enabler addon wasn't released until just several weeks before BC, so if that's usable then AV isn't going to feel very classic. I seriously hope they disable it in the same manner they did in 2012 as I do not like what it did to the game.