We're talking here about managers that thrive in underdog environments, and managers that are made for the biggest clubs in the game. If Klopp can't come into a club like Liverpool and mark his authority on transfers regarding his superstar players, well than I see an issue with that.
You do not see the part "culture of the club" or "balance of the company". Your point is definitely made in bad faith and sidesteps the specificity of each challenge.
Firstable, you were talking about Dortmund. The club which had just avoided a bankruptcy... They never and still do not have the money to keep theirs players and compete durably with the top 3. Anyway, he still managed to win titles against Heycknes and go to final with one of the youngest team ever.
Who did he actually sell in that team like you said ? No one. Gotze had signed a new contract but Guardiola' arrival and a huge salary'proposal that BVB couldn't afford made him wanting to go. He had a clause, he went. Lewandowski never wanted to extend but Klopp succeed to keep him until the end of his contract.
Then, At Liverpool, you criticizes the fact that he sold Coutinho ? And would have made the same with DDG... Perhaps i have an other definition the institution, but when a player doesn't want to play for the club anymore and actually thinks the grass is geeener somewhere, I don't see the point of retaining him. That's a PSG stuff. Let them go and another player, more concerned, will fit well at their place (Walker/Trippier - Alder/Sanchez...). Of course you will lost the mercanaries, greedy, not ambitious ones (Alexis) but the more commited will stay and at a CL level, that counts (comparing Pogba who already complimented Neymar' PSG with a Marcelo, Ramos or Carvajal...)
Coutinho didn't believe in the club project. Talented or not he actually never won something with Liverpool. If you're starting to stoop to Coutinho demands... Plus, he will probably be replaced by Lemar or Draxler.