Its not vacuum. Its whats right and fair. Koeman had a disastrous team at disposal, and they didnt give him a chance for january reinforcments. He'd deliver the boys same as xavi did, if not better. Its already been a 2 and a half years of xavi reign where we still are in no mans land. False dawn was in the first season, but how much of that goes to auba, dembele and adama and their pace upfront, luuk scoring clinicaly one could wonder. Auba should have stayed. Damn, so many wrong decisions in such a short span of time its simply laughable.
His first half was about rescueing Koeman's car wreck and reaching the CL, so the club doesn't go bankrupt. He fullfilled that goal. His first full season we got knocked out in the CL group stage, but won LaLiga. This season without Araujo's stupid mistake, we play the final in Wembley and in LaLiga we'd also have more points if the refs didn't fuck us over, especially in both clasicos.
If that's no mans land for you with a team under heavy financial restrictions, then okay. For me it's acceptable. The club knows by now he's not Guardiola 2.0. But there is no guarantee of better football with a new coach if he's not Pep or Klopp and we can fall down even worse. Not to mention the wasted money for a new coach and his staff.
If the club isn't certain about a new coach, it's the safer approach to hold on to what's acceptable in the moment during construction. You can see the stadium construction as a metaphor for the team's as well. Even in the jungle, a baboon only lets go of one branch if he has another in his hand. Laporta didn't have a certainty of a new good branch, so he decided to keep the old one where you're sure you don't fall to your death at least.
Also it's always easy to imagine players who left would have performed better. Auba saved the club financially to register all the new signings by the way. If instead of your mentioned Auba another would have been sold like Torres, you'd post the same sentence with his name. It's your imagination that things would have been better, not fact.
Also funny, how you blame the players like Auba, Ous and Adama for good results, but Xavi for the bad ones.