I love the fact that thievery is in the game, but I have some suggestions to make it a more decent experience for folks!
For starters, what I am going to call "Ambient Items" (or the items that spawn at vendor stalls and the like). I love that you can pick these up, but I would love it even more if they had a small chance of being a Green/Blue/Purple item with a random trait or upgrade, and I would like it even more if they had the possibility of being a zone-based set piece! Imagine that you're just doin' your usual looting and suddenly BAM, you get a decent piece of zone gear! It rolled blue, but a quick upgrade of that after laundering it would make it a nice bit of kit!
Secondly: Guards!
Guards are obviously a hold-over from a time long ago when the faction war was at its height. Now, they only really function to keep thieves at bay, but the issue with that is that they have FAR too much health! Wouldn't it be great if you could, you know, actually defeat them (in a reasonable amount of time?)? I recommend changing their HP down to a decent Solo Boss HP level, and give you a, let's say, 1,000 Gold bounty per guard you kill along with a possibly decent gear drop? This would make it a struggle to take on multiple guards at once, since they're still pretty beefy, but it would also give you a reason to slay them if you want to see what they drop (or you want to build up your bounty for whatever reason).
Simple changes that provide a better experience for thievery, I think!
May your crops be sun-blessed, sweet soul.