Just my many cents regarding the heavy handed incentive for players to use default UI. I don’t think its that bad, a few simple changes could go a long way in my opinion.
Cooldown manager: I think this function doesnt really do anything special that I couldn’t achieve by just using action bars, if anything this is more restricted. To me, the only functionality of cooldown manager is in buff/debuff tracking.
Buffs/Debuffs: There is currently no option to have multiple buff bars. Yes, I can track certain things as bar and certain things as icon to separate them that way, but if we had an option to add additional of either and track certain buffs on their own would be appreciated.
Many players are used to tracking their defensive and offensive buffs separately, which is currently not possible.
Personally I am used to tracking everything as icons, not big fan of bars in to track my buffs. I would prefer having a bar for my offensive buffs, my offensive debuffs, and my defensive buffs, this would require 3 icon rows, and currently only have 1 available. Having this type of additional buff tracking available further allows people to customize their UI in a more sandboxy way, and would be a lot closer to what we were used to with weakauras.
Resources: currently resource tracking is probably the worst part of the default UI. I can see my resources under my player frame, or on the personal resource display. The personal resource display does not show numbers, only bars. As a Death Knight for example, I dont know how much runic power I have, I only see a bar but unable to tell my exact resource amount. This is bad.
There is currently no option to deattach resources from the health. There is a single option regarding the personal resource display, which hides BOTH of health and power bars. So again, as a Death Knight, there is no option to show only my runic power and runes, my health has to be attached to it. There should be an option to separately toggle health, primary, and secondary resources.
This leads to player frame, we should also have an option to hide resources from it, maybe even the portrait. I would prefer to have my player frame as 1 big bar, and track my resources elsewhere separately.
Nameplates: apart from the memeworthy stacking option, which I imagine will be fixed in some capacity, my biggest problem is that everything applies to both friendly and enemy nameplates. I can simplify friendly players, but that removes everything except class color. I would like to be able to be more selective with my settings. I imagine something like the graphic settings has Base/Raid and battleground versions, we could have this also for Enemy NPC and Player/Friendly NPC and Player.
Damage meter looks good from the preview, hopefully it will have features similar to what we are used to from Details. One important thing in my opinion is the death recap of Details helped players understand why and how they died, this is an important functionality to add.
Bossmods havent had the chance to try them in action, what I can tell is I have no idea what will be classified as Minor/Medium/Critical boss warning.