If
we could search for + items
we could place our retainer where it belongs, and not be forced to place it elsewhere because the ward is full
the ward system didn't require so much over head on the server and clients
retainers didn't completely obscure other retainers
the market didn't reset every update
the wards didn't crash on a regular basis
we didn't have to go through 5 wards just to get a decent amount of materials
targeting wasn't so horrible

I may have missed a few things.
Purchasing/selling items from/to players should not be an adventure in itself.
Sometimes people just want to grab that food they need and go.

And please, don't give us the 11 AH, it wasn't an AH, it was a mindless game of guess the price