Yeah, because most of them never played vanilla before and want to try it out. They only read romanticized posts about and and watched pvp frag movies and shamans/warriors 1 shotting people. There is nothing wrong to want to try out something that is long gone, but releasing a game in piss-poor state of "my pet still glitches out and refuses to eat", or "this node is impossible to reach for whole 1.* patch and no one bats an eye about it", or "yeah i guess falling down through floor after charging is fun", or "yeah i guess this flag carrier sitting on the wall being unreachable is also fun", or "yeah, not gaining any rage from absorbing an attack is also cool. Better drop my pants of i guess, or just sit to get crit in the face"
There are going to be changes, i sincerely doubt that they'll add stuff like transmogrification (but i really want them to connect retail to classic to classic gear will transfer to retail), or short cast on mount, or mounts and pets not wasting space in bags, or auto-loot, or somewhat troll-hostile roll system (yeah the "best" part of my vanilla experience was to get corpsemaker rolled by fucking healing shamans or hunters). But again, they are aiming at providing authentic vanilla experience, authentic experience is not a copy and paste by any stretch of imagination, if they'll manage to deliver us authentic vanilla experience while also making QoL changes - great, but if these changes will intersect with their vision of "authentic vanilla experience" - they won't make them.
The whole thing about WoW:Classic announcement - is that they literally said nothing about it but "we are going to hire a team to work on this", and the vague "recreate authentic vanilla experience" thing, so everything is just speculation at this point
- - - Updated - - -
I would fucking love it