Of course our players aren't physically good enough as Dortmund's to press all the time. But the difference is that because we aren't playing nearly as direct as Dortmund we should be able to keep the ball more and thus in turn have to press less, but with the same intensity. Lacking the mindset is also not exactly true since they were doing it a few years ago.
Pressing is also a lot about the structure itself. In order to be able to press effectively, you already have to be in the right positions before you even lose the ball. That means occuping right spaces and also overloading zones. When you lose the ball in that zone you already should have a numerical advantage to win the ball back and you don't have to physically engage that much.
Also what Guardiola and Klopp like to do is installing pressing traps and triggers. Sometimes their players leave a pass open on purpose (for example to the touchline). Opposition plays the pass and the receiver is immediately in a numerical disadvantage. Our pressing at the moment looks bad because we don't have any structure and of course because we leave the middle open with our central midfielders pushing wide.
In his 6 years in Dortmund Klopp has changed his style. The only thing that is constant is the intense pressing. Back then when they won back-to-back Bundesliga titles they were keeping the ball more and actually were creative with it. Nowadays they rely too much on their pressing which is a bit difficult against opponents that sit deep and only hoof the ball away. So from year to year they're getting more direct which is why they seem to do slightly worse every year in the League.
Pressing is a chore, it's dirty work and seldomly reaps a tangible reward. It's physically and mentally draining and every player is guarenteed to put completely useless kilometers in. Players also know that it's them who pay the price for the intensity, like Bielsa's Athletic who completely burned out towards the end of his tenure or the bunch of Dortmund players spending a lot of time in the sick bay, not to mention the elevated injury risk in the long term by the constant overstress.
When players mature and realize that they can get by without the intensity it causes them to tone their efforts down, consciously or not. Our squad, loaded from top to bottom with decorated vets and elite players, knows that they can get by without it and therefore can't be arsed to put the extra effort in, even when they have the physical requirements. Furthermore, coaches, being forrmer players themselves, won't even ask them to do it because they know the psychological constraints.
Putting this quite bluntly: As long as players are in a stage of development and still have a point to prove, they can be asked to press intensely and they will do so. If they don''t, they don't. This is what I mean when I write that many of our players don't have the required mindset. And no coach with whatever motivational approach can change this because it's not a motivational issue at it's core, but a psychological one that can't be fixed. Pep knew it and left. Tata knew it and switched to a pretty docile midfield pressing pretty much from the get go. Lucho knows it as well, yet hasn't found a pressing system that works (yet ?). And I guarentee you that no coach would be able to return to the high intensity pressing approach here with this squad. No Pep, no Bielsa, no Klopp.