If they shard the first 6 levels, if they shard for just a few weeks, you are setting up wow classic to have further issues. Here is why I believe this is the case.
Vanilla wow was a community driven game. When the game launched, servers were crowded and overpopulated because blizzard underestimated the success of wow. However over time blizz added more servers, making the playing field more even so to say. I use to love joining these server launches, I would not be there for long but the feeling of everyone starting from scratch and clawing their way to the top was amazing.
Classic is a community game first. Your server, is your community. If you shard, even if it is only for the first six levels, you are taking people out of that community. There will be several new vanilla players, and those players need to realize exactly how things are. When you take them out of those communities via sharding, you are giving them the chance to form/continue the bad habits that modern day wow is responsible for.
Sure, the first few weeks are going to be crowded. People are not going to move at the pace they would like. However you have to consider that there will be a great deal of people quitting because classic is just not for them. When you shard, even if just for an hour, you are giving people instant gratification, when in reality classic gives the furthest thing from.
People need to learn how to work together, how to be kind to the community they now belong to. Servers will be jenky (because let’s face it, underestimating a launch seems like a business practice for blizzard). In this first week, people will form friendships as it will be far easier to work together in the earlier stages. However once again, when you shard even if it’s for the first six levels, you are doing something that will literally be detrimental to the early health of each server.
No changes. Do not shard. Stop trying to spoil people, if you want to give people a true vanilla experience, let them suffer with the high population overcrowded servers like we did at launch. They will be stronger for it. People will immediately known who they want to group with and who they don’t. The most beautiful feature of classic wow is the community, when you take that away even for the first few levels for a few weeks, you are taking a knife to the heart of what vanilla wow is.
One of the big reasons I have been craving vanilla is the sense of belonging that went out the window with dungeon finder and cata guilds. Experiencing vanilla without sharding is showing people that they can’t just be another speechless character like in modern.
Thank you for listening to my rant. I played from the open vanilla beta in 04 onwards. I am very passionate about vanilla for many reasons. I hope you will consider no sharding at all blizzard. People need to learn what the vanilla wow community is like at the very beginning.