Leveling in vanilla,especially with the re-release ,with hundreds of people doing same thing you do,is going to be tryhard alone.
People quiting on PTR before 30 already...
There are quests for which you have to fight trough opposite faction,mobs and to make it even worse - your own faction.Sure,its going to be fun to die 20-30 times by the time u reach quest from SW to Kalimdor/Fellwod (example) that alone right there is at least one hour just walking to your corpse,and if you are telling me that's fun,then i am sorry because what is fun to you,and what is actually fun is heaven and hell difference.
I think people forgot that whole SM GY at level 30,gives not even 3 bars of xp,and that's only one example.It takes you 15-20 minutes if not even more to do one full GY run.That's 20 minutes per 3 or less xp bars.
People think if we did it on private servers we will do it on retail.Yes sure...no gold boting and gold buying on retail vanilla,at least not for the first few months.
Only real fun who's gonna have in game is streamers with followers and FEW other common players.
Streamers because they know they won't ever farm single gold,and they will have LFM on demand.
Few other people for sole reason of being blizzard fanboy.
If you as casual think you will have fun,then i am happy for you.
There's reason why everyone remembers vanilla leveling,gearing and pvp experience as literal HELL,and back then,you had literally 32 players on some servers at certain hour,which means population wasnt that great to begin with,imagine 5-10 servers,filled with people in every single zone there is.Ganking,stealing mobs for quests,loot-able objects etc...
My point,every single of new released servers are going to be capped.
You want to relax at level 20 and do some questing at Lakeshire,you go there,and you see 40 man horde premade...you either wait for hours or go to another zone,just to get ganked by raid of rogues.
This all happened once,and it will happen again especially with all 'toxicity and seriousness game turned into in past 15 years.