Do you think Blizzard should aggressively use sharding technology in Classic?
Here is an example of sharding technology:
https://clips.twitch.tv/UnusualComfo...trawberryKappa
https://clips.twitch.tv/AbstemiousRa...DogeBloodTrail
According to Blizzard sharding will be in Classic:
https://us.battle.net/forums/en/wow/...548630#post-15
In a nutshell, sharding means that you can not have lets say more than 40 players in the same area and when this happens, other players will disappear on your screen and you and other players will be split into different smaller instances aka shards.
What is the problem? Well, imagine you are questing with people around you, you see them, you interact with them and out of nowhere you are thrown into another shard with completely different players. Do you remember these huge South Shore and Tarren Mill fights or city raids? These will be sharded, means there would many instances of Stormwind, Orgrimmar and so on.
Why shard? Blizzard started using sharding technology aggressively in later expansions to facilitate engine limitations to prevent server crashes especially on major content release dates due to large number of players starting in the same areas.