The reason Varric's talents are so overpowered were by design; he has to have them to make up for the fact that he can't have gear(even less than other companions, as you can't change his weapon), and have him be useful despite of it. If you are trying to prove that "Varric stronk" then congratulations, but if you are trying to prove the combat wasn't designed to be PC-centric then you're doing a pretty poor job of it.
We're getting pretty off topic, but if you would like to continue this line on discussion in private then feel free to PM me.
I made a huge post addressing what you said and you only had to say something about the Varric vs archer Hawke even failing to understand the point because you obviously don't have enough knowledge of the game. If you are going to talk about design, make sure your info is correct.
So let me make myself perfectly clear. You said that the game is balanced around the pc. I said that there is nothing inherently superior to the PC using the same abilities as any other companion. The only difference is access (which changes from the DA2 model in the next game as the developers have stated and it was free for all in DAO). Thinking that the PC is important and getting some optional plot bonuses is irrelevant to the design. Gear is irrelevant to the design. Any companion would have approximately the same benefit from gear and plot bonuses. Just because you prefer to load them on the pc or the game doesn't allow any other option doesn't change the design but all it proves is that the pc may potentially reach higher levels of power using limited resources. This is different than what you are saying and it doesn't even have to be this way in DAI like it wasn't for DAO.
You quoted me to advocate that the pc is more rewarding to be played actively and claimed that the Flanking ability of shadow spec is indicative to this. What I said is that your example is weak because 100% critical chance is a triviality for the rogue class and if you are forced to use this ability then you are doing more bad than good for your damage output. By making a more "uncomplicated" build for your rogue you perform better. Also there are other companions that benefit greatly by being played active. Sebastian (which the tactics can't use his chain ability well, nor do decoy combos), all mages, especially bethany in legacy who is a force mage. Archer Hawke in higher levels only thing that needs is a "target next->attack" plus ccc tactics and he is the picture of efficiency, unless you are playing a more involved build like walking bomb. That's only for nightmare due to friendly fire and the only thing he needs to do is plant a decoy.
So what exactly do you mean "balanced around the pc". Do the companion abilities scale according to the pc's power? Are you forced to tie your tactics to the pc or does it get any special treatment? The game numbers are balanced based on a generic character or party that has x gear and y skillset. The math aren't different for Hawke. They are exactly the same. What you want to say is that the game is better played when the party reacts to the actions of the controlled character, and since the player character can get stronger because of gear and plot bonuses is usually the best to use manually. But these are different things and what you are saying has nothing to do with balance. While I don't disagree with you on this, it's not important enough to define how someone should play and that's why the op makes a good point.
Finally to answer the post I quoted I'll just ask you a question. Why not make Isabela and Fenris overpowered as well if the point of the design is to compensate? After all Varric has a weapon that scales. Isabela and Fenris will always fall behind unless you spend half your gold buying them weapons. What you are saying is inconsistent with the design of all other companion specializations. And you pretty much got it backwards as far as gear is concerned. Varric will always have a good weapon, so giving him the best autoattacking specialization simplifies things cause he can have respectable damage and can still specialize in the support trees. It has to do with "ROGUES SUCK, LOCKPICKING BOTS" that is a thing with DAO. He is the jack of all trades and also the most compelling character in the game so you have an incentive to bring him with you. Being better than archer Hawke seems more like an oversight on how they designed the pc specializations. After all I doubt that they set out to make a game that only thing that matters when optimizing your character is stacking critical modifiers. Rogue is so stupidly overpowered due to the double dip in this game that it's not even funny. At least in DAO he was OP because he could reach 100% evasion chance against normal enemies, not 3 shot every boss in the game.