Maybe the problem was Paratici didn’t have to sit through the tedium of Mourinho. Appointing a manager who learnt his trade under Mourinho and essentially has the same core setup seemed odd at the time, and clearly the fans (maybe the players too) don’t have time for it.
That we give the ball away 9 times out of 10 when we try to break means we either don’t have the right players for this system or don’t have the patience to adapt to it. It’s probably the latter.
It used to be that our players were just drilled in one system - the core of Poch's team knew how to play one way, and no other. It's one of the consequences of the all-aspect gegenpressing philosophy - the formations can change (and often did - Poch was a master at in-game changes), but the overall philosophy remains the same. Because every single aspect of the club's approach, from recruitment (fitness and hunger first) to tactics to training, is geared around implementing that style, and there's no time to drill other approaches.
Additionally, the style itself creates an overreliance on pressing as the main and only method of chance creation (pressing up high to force turnovers), defending (likewise, reducing the opponent's time on the ball) and positioning (always oriented to the opponent's players to trigger pressing traps). It does this because it's arguably the most effective way to do those things and it can turn limited players into effective ones in the right system - but the downside is, it robs players of a lot of practice in using their natural abilities to overcome defenses without the press (by retaining the ball well, playing smart passes, waiting for your moment).
It's also susceptible to collapsing when players just don't have the belief to do the running anymore - that's what happened to us when we failed, and what Liverpool avoided by succeeding and reinforcing faith in their system when they did. And it tends to fail as we've seen - players can't trap a ball of cement, can't pass well, can't dribble well, make wrong decisions in and out of possession. Because they haven't had to use those skills much when they relied on pressing-based chance creation, defending and positioning - to relearn the ability-based approach over the tactics-based approach mid-career is hard, and it made fools out of a lot of our bunch. Dortmund were the exact same way at the end of Klopp's tenure when the belief failed.
Poch saw this. He saw how his system was failing slowly as the team lost belief. He wanted a refresh, a renewal - he begged for one for a long time, but that worthless waste of an owner and his mediocre henchman of a chairman didn't believe it necessary. And then, ultimately, his system died, and he was sacked - the man who led us to the cusp of glory, gone because he wasn't listened to.And Mourinho, his replacement, while a flawed manager and even more flawed man, he saw this - he would have to oversee a transition from fitness-based team pressing to a more naturalistic, individualistic style of chance creation and game management. He tried - he set up a defense and then his instructions to the team were basically to let the attackers create. But the players couldn't overcome their innate flaws in time to actually get used to the death of Poch's system, and the odious man failed as Poch did.
In our case, the biggest victim of the death of Poch's system is Dele - he's the ultimate single-role player, who looks good as a false nine in a pressing-based system where he doesn't have to hold onto the ball, make long passes or really do much other than press (which he does excellently), make short, instinctive passes and run into the box. When asked to play a more cerebral, slower game, he's always, always struggled, for England and Spurs. It's no coincidence.
So, part of our decline is down to that. But not all of it, because we've bought players who weren't drilled in that system (Bergwijn, Lo Celso, Ndombele et al) and they've still turned out sh*te. So the other part of it is also present - it's just no one knows what the f*ck it is.