Reasons Why Classic WoW was so great and lovable:
1) EXTREMELY REWARDING GAMEPLAY.
-Moneys were earned with the blood and sweat. The more enjoyment we got when we earn the gold.
-Profession were harder to level. The more enjoyment we got when we craft some good items for themselves or auction.
-Items were harder to get. The more enjoyment we got when we get some items from dungeons and professions.
-Dungeons and Raids were harder. The reward we got from bosses felt much more valuable.
-Quests were harder and required more time to do. The more we enjoy their completing and reward.
-Exploring. Hard content, professions and quests motivated us to explore the world which was greatly designed.
-Spell Design. The different level of spells was highly required for an effective healing. That made the class gameplay more interesting and flexible.
2)Focus on socialization.
-No LFG and LFR. People spend their time in chat finding people to do dungeons and raids.
-Hard quests and mobs that required more than 1-2 people to do them and kill them. That allows people to communicate more often and even create bonds.
-Leveling was slower that allows people to spend more time together during questing.
-WPvP was more rough. That makes people to group up and help each other.
-Profession were done the way people needed each other to craft some items or enchant them.
-Raids and Dungeons required communication. Crowd Control required the better coordination.
3)Sense of Progression.
-Talent tree allow people to spent 1 point of talent for 1 level. It makes every level felt earned and rewarded.
-Every new item we earned in dungeon or hard crafting made us significantly stronger.
4)Immersion.
-World Building was great. Location design, visual and music were and are top level.
-Quests had no map markings. That made us read the text and THINK where to go to do the quests.
-Leveling design was done the way that dont make people rush forward. We felt comfortable to do stuff slowly.
-Process > Result. WoW Classic had great pacing. Reaching the cap wasn't the main goal. That allow us to enjoy crafting, gathering, fishing, exploring, trash talking in the inn, do dungeons with friends and stuff.
Thats what made WoW Classic great and THATS WHY we always wanted Blizzard to bring us the Legacy servers.
Now, about the things that has nothing to do with WoW Classic Greatness:
-2004 yo settings. WoW Classic still looks very good and comfortable to stay in. So as do Legion. There are no reasons to not have the update graphic options. Be honest - the water textures until Cata looked really bad. As do cubic trees and bushes.
-Old Models. Left old models the same BUT add an option to use an updated models. Many people including me enjoy old models but there are also many people who liked Classic but prefer the updated models. Why not to do the thing that has nothing to do with WoW Classic greatness?
-Class Balance. I saw no one said: "You know, WoW Classic was great. Paladins were healbots who do shit in other specs, no one wanted Druids even if they went full Restoration, and Arcane mages sucked hard". I saw many people said: "Wow Classic was great because the content felt more rewarding and people communicated with each other much better".
So, there is NO sane reason to keep the Class Balance the same as it was in 2005. There are many people who loved Classic and played feral druids, retri pallies, enhancement shamans without Sulfuras. Why not to make them slightly happier? Did their utter shittiness make WoW Classic great? Absolutely no.
Blizzard should make all class specs playable. Im not asking for global changes like totally new spells and talents. Im asking for numbers tweaks and some changes of talent mechanic for some of the specs to make them competitive.
-Few small interface flaws. I want to see how much hp my teammates or enemy has without Xpearl. That doesnt ruin the gameplay but gives an essential comfort to gameplay.
The things i mentioned above are an essential updates Blizzard need to make in order to make WoW Classic THE SAME but BETTER.