i'm bringing him everything we've "achieved"

On the other hand, we have lohen , who RESTARTED these experiments, indirectly got his mentor killed....and his only punishment was...not getting promoted?

Like am i reading this right? is this writing intentional to show how hyporcritical the knights can be, or is it just finding a way not to punish lohen severely because he's a playable character?

Varka, for starters, is the biggest hypocrite and willingly stupid guy in Mondstadt. The game reallly wants to make him just a funny guy but he's smarter than he lets on and turns a blind eye when someone he likes hurts his knights as long as they're left alive by the end of the day.

So for Eroch (and exactly why I genuinely put blame on Crepus' death for Eroch AND Varka AND Crepus himself) Varka saw this guy who was spiraling and getting worse. Everybody noticed. Here's some reciepts.

"Gebhard: And he never spared the manpower for something unless he'd get credit in return. No glory in something? You'd get scraps. Same breed as that scumbag Eroch.

Hedwig: Driven by a strong desire for wealth and power, he was corrupted and led astray — quietly involving himself in all sorts of unsavory schemes. His intelligence and skill at arms only compounded the danger he posed.

Diluc: "Warped obsessions and the passage of time can turn friends into foes as easily as the wind changes its course." 

Varka: ...Quoting Crepus, are we? That really takes me back.""

If it were say, simply Gebhard or Hedwig then MAYBE I'd understand, but Crepus was Varka's closest companion alongside Eroch, he would know Eroch better than anyone else besides maybe Dottore. But Varka? He ignores Crepus' words and chooses to act like nothing is wrong.

Of course, we all know how that went. Crepus dies, Eroch is exiled from Mondstadt, Varka then (presumably) gets some knights to charge Eroch and the Fatui and they all do Ursa steroids and Eroch dies. So, what does Varka learn from this?

Well, certainly as much as Adorno did, that is to say, nothing. Lohen is Lohen (that is to say, Eroch lite) and Adorno decides to make him Varka's problem. Of course, Varka doesn't care and hires Lohen and decides he just HAS to bring the guy who tried to drug him on his expedition. Lohen returns, we get some lore drops and do his quest, poo.

So, after Lohen and Theodore decide to play around with the experiments left behind by Eroch, Lohen decides that just resembling Eroch isn't enough and he's gotta get power. Theodore is a bit more noble but he's also an idiot and doesn't get that angel power MIGHT make the dying old man die faster.

Ofc, Varka decides that the logical thing to do is give Lohen another chance and let him do whatever he wants which lets him and Theodore kidnap Adorno and drag him to the lab. Lohen finally smarts up and you know the rest, Adorno dies and Varka decides that grounding is an appropriate punishment for the two guys copying his insane dead friend.