Honestly. All of you people who say, "just have fun on the server", is kinda just being one-sided in your opinion. I get that you play this for nostalgia, and that you wanna experience the old Tera, believe me, If I could experience World of Warcraft Burning Wrath of the Lich King again, without p2w private servers, you can be hella sure I would do that.
That being said, I feel like you don't understand the issue at all: It's not the fun that's the problem, I'm sure getting to level 60 is fun n' all. But as I'm a new player, who never once tried Tera before RKE got released and didn't understand basics of the game until like 5 - 6 months ago, I feel like the Classic server is one big joke, considering getting to the so-called "fun parts" take the same time as the servers are up for. I'm not even gonna lie: I quit at level 28 'cause I was so extremely bored with getting to level 60.
I would really love to try out the old dungeons and see how the combat was back then, and how the old bosses were, but the problem is that you lose motivation before you even get there. Face it: It's nostalgia yes, but that doesn't change the fact that right now Classic server is boring af, because the progression is non-existent. I expected Manahan and I got Black Desert Online.