Here are my thoughts on how to make this game a bit better as it is right now.
Before I start I would like to say that you shouldn't compare dbog to another game you like or love. DBO is a typical asian grinder mmorpg.
Yes we all would like to have a better fighting system, more content and so on but sadly because of the technical limitations we won't.
We need to balance THIS game and not an "ideal dream-like" dbo which does not exist. I know you guys will hate me for my suggestions but I think this is what the game needs.
So lets start with "MY" changes:
1. Bring back broken card
The problem with "no broken" is that you only need to farm your gear once and after that you are done with pve. So because your gear can never be destroyed / deleted after some time we will have more items on the market then we need. This will also break the economy ingame. Moreover this will make it harder to get +15. I personally think a game always needs space for improvement. We saw it back on POB and now in OB people get way to fast +15. Yes bots played an important role but they just speed things up. +15 should be something "holy" that's nearly impossible to get and when you get it it should stay something special. Also this game should be balanced based on +12 gear not on +15. The best players should have on average +12 gear and only a small number of people should have +15 but only with alot of hard work (not only with 1-2 months of farming 1h a day) and alot luck. +15 Should make you crazy strong.
2. Increase Upgrade reduce on broken card when using white stone
Right now if you are using a white stone and get broken you will lose 2 upgrades. Back on retail it was 4-6. We need that back. Upgrading should be really risky but at the same time high rewarding. +6 Should be the normal upgrade for average players. And only if you have alot of money then you should upgrade your gear higher then +6.
3. Reduce successrate of upgrade
Reduce the successrate of upgrades. Everyone who played the game in the last few month saw all the +15 upgrades. More than 5 items per day to +15 and that each day and that we so few players online. That is stupid. Good upgrades should be something special.
3. Reduce droprate of Upgrade Stones
Reduce the droprate of upgrade stones. It should be hard to get upgrade stones. Yes I know upgrading is frustrating but make upgrading something special. In all the asian grinder mmorpgs I played until now upgrading was the last thing you would do. It was something that only the rich people could efford. I really liked that idea because you are forced to gear up to a specific standard (+6) get all your accessoirs weapons and armors and only after that it made sense to focus on upgrading. +15 is the limit but that doesn't mean that it also should be the standard for all good players and before I forget it make the droprate of white stones way less than the drop rate of purple and green stones.
4. Reduce brown boxes extremly and increase the chance to drop good effects
Make the price of brown boxes in cc dungeon much higher and don't put to many brown boxes in events or cashshop. Gear should be dropped with the right effects not switched into the right one.
People should farm the right gear in open world, tmq, ud, bids. Farming should be worth doing not something you do only for "fun". But for that the chances to get a drop with good effects needs to be increaed. It shouldn't be to high, you should not get a good item in a few hours.
5. Make everything tradeable
Every item should be tradeable. Some people don't want to farm but then at least the guys that do the farming should be rewarded by the players that want to cash their items. This way the "farmer" and the "casher" would be happy.
**Edit 18.09.2018 here
6. Remove crafting
Crafting is way to fast and easy. You get nearly the best gear for doing literally nothing. You get much more craft items back if you break the crafted items than you used for them. Back on tw crafting was released much later with lvl 70 cap where it didn't really matter but back then it was much harder and more expensive and more time consuming to craft. I would say just remove crafting.
until here**
Now let's the hate begin.
Just because I'm curious I would like to have your opinions if you
a) agree
b) agree in many aspects but not all
c) disagree
d) disagree in many aspects but not all
with me. Thanks. 
P.S.
At first I wanted to make a post which contains all my ideas about dbog changes but while writing this I got pretty bored so I will probably seperate it into multiple parts and write the other parts someday later (only if I feel like doing it). I call this part the "GEAR" part.