Hello and welcome to the community!
You have some great ideas and we are always happy to read comments like yours ^^
We are all MMORPG players here and definitely know what you are talking about, the immersion, the combat, and everything.
No one will argue that WoW's PvP is the most fun out there. One of my favorite things in WoW was staying in front of Stormwind, making duels with other players, while waiting for the BG queue. My best friend didn't want to play with me Guild Wars 2 just because of the lack of World PvP, which is a lot of fun in WoW, I have countless memories of world PvP battles in TBC and WotLK.
We will try to achieve that but in our own style.
As for the community, we will read and listen to all suggestions and feedback, but of course, we will implement only what is good overall. We know that the game will never be liked by 100% of the people and that is fine, there isn't a game where absolutely everyone likes 100%.
Topic 1: I 100% agree with the need for realistic drops. I hate seeing Platemail drop off a wolf. A wolf should drop fur and meat...not gold and swords.
I'd also like to see an MMO implement drops of items the Mob is using. Example: A gnoll has a nice shiny sword that normally isn't part of the gnolls "kit". You recognize the sword as a rare magic item "Sword of Shiny". There should be a percentage chance for the gnoll to drop THAT sword. Rare mob spawns that have and use actual magic equipment seen in the world.
Topic 2: WoW PvP is some of the best PvP ever seen in a game. Blizzard screwed up by not designing the game for MASSIVE open-world PvP. When WoW first launched we'd had HUGE battles in Hillsbrad that would lag and crash the server. It was AMAZING and fun...even with the lag. Blizzard's fix was battlegrounds because they couldn't fix their bad netcode. Later they used layering (ugg...never layer your MMO game) to band-aid their bad code. PLEASE DON'T MAKE THE SAME MISTAKE!! Battlegrounds are awesome...but spontaneous massive open world PvP battles are sooooo much more fun. Imagine if their were actual open-world PvP objective that brought people together to fight. Please make sure the netcode in the game is up to massive open-world PvP. Objectives would be icing on the cake!
Topic 3: I agree, part of what makes WoW PvP combat fun is the strategy stuns provide. In addition to stuns I'd also recommend "Limited Action Sets". Limited Action Sets are part of the UI and only allow a set number of abilities to be on the players action bar at one time. By forcing players to choose what abilities they take into a given situation, you add a level of strategy even beyond what stuns give you. Players could toggle between action sets out of combat to allow ease of use and add more strategy to combat.