Trading and pvp is very important for d2 culture.
D3 had almost none of that. I hope D4 won't have similar issue.
1) We know that auction house is just bad for the game because the rich is the strong
2) How can we utilize in game gold more effectively? and if they make in game gold too much of a currency, we will see mass botters again, like diablo 3.
3) When it comes to trading, we like idea of freely trade like diablo 2, instead of d3 current trading system, where you have time limit to trade with only players in your current game.
Also*, We know blizzard did this to counter bots. but at whose cost? the diablo community... it takes away diablo culture just to counter botters? why don't you double, triple, 10x, your anti-cheat game? literally so advanced and update so frequent that botters will be banned so quick that they don't have enough time to make any profit for purchasing another key.
there are just so many problems, we basically want something that's very similar to d2 culture. but better.
We want;
d2 pvp style
free trading
skill customization
stat customization
Those are some key points, and we know that hackers,botters, will try to find a way to make profit from this. Blizzard's job is to fight these people so we can have nice things...