One of the reasons I stopped playing retail around super early Cata period was because I didn't have the freedom to enjoy all the content (when I was young there was little guarantee I could stay at my PC reliably to raid or even do long dungeons, hence I missed all the end game content and decided there was literally no point in sticking around); when I joined up for classic, I had the freedom and independence to see a raid through to the end, and enjoyed raiding with a guild; I ended up leaving again but I can't recall why I lost interest. I came back just before the release of Cata and joined a guild there and finally did some raiding and had a heck of a time (but left again before the deathwing raid dropped; our guild leader just fell off the face the earth and none of use were guild leader material and the guild just died as everyone just dropped WoW). Raid mechanics were also hard in Cata (lots of stuff that needs fast reaction time), and as I've been hearing, it just gets harder and harder; someone told me modern retail makes Cata mechanics seem like child's play, reading through the mechanics for just one boss fight (dimensius I think his name was) I'm inclined to agree.
I'm looking forward to raiding in forever and here's to hoping old style raiding is at play, cause I really don't want to have like a million mechanics running through my head (whilst requiring fortnite speed reactions) while also trying to maintain high dps, or tanking reliably.