I understand why are the people so exited about classic but most of them don't know what they are getting in to.

You are praising for example summoning with warlock. One summon took one soulshard from you inventory so you would have to have full bags of soulshards to summon a whole group, same for the healthstones 1 hs = 1 soulshard. And its been a time when soulshard can be acquired only by killing monsters what gives you experience.

Its good to know that warlock have such kind of utility but for him it would take like hour to get all the shards needed for a raid.

A lot of people praising the things like this and actually don't know what it is like.