I think this is pretty common knowledge for Barca fans. We have been awful away for a long time. Our team just can't handle any sort of pressure and we can't play defense. The team you mentioned could absord pressure which is very important in away games.
But check the pattern:
Pep had something like 20% of wins on away KO matches.
Cruijff something like 16-18%.
Rijkaard 50%.
Pep's City continues to be an ultimate shit on away matches, conceding 3-4-5 against anyone in Europe.
What are the similarities?
= Pep's and Cruijff's too attacking style is usually suicidal in Europe.
It works perfect in league competitions over 38 matches where the opponents are usually weaker than you.
Pep's style is by far the best style for terrorizing Getafe, Girona, Las Palmas and other lowtable teams.
In Europe, though, that style worked ONLY when we had the best generation ever.
Both Rijkaard in 2006 and Lucho in 2015 actually won a CL when we MOVED AWAY from our style.
Rijkaard played like AC Milan: strong defense, more physical players, but we still had a touch of magic upfront.
We didn't concede goals, yet we always found a way to score 1-2.
So, we didn't play to score MORE than opponents, but more like: to concede less than the opponent.
Lucho in 2015 totally abandoned possession and our midfield.
Our game was similar to Rijkaard's in a lot of areas: strong defense, we weren't leaking goals.
Yet, we had magic in attack and we always managed to score.
How I see Pep, his matches in Europe always tend to end 4:0, 0:4 or 4:4.
He is asking for goals, but he is also asking for problems at the back.
Rijkaard wasn't asking for problems in defense.
Lucho wasn't asking for problems in defense.
Real Madrid who won 4 out of 5 didn't ask for problems in defense.
France in 2018 or Portugal in 2016.
In fact, you can find a lot of similarities in all these teams mentioned above.
Since Pep in 2011 and Spain in 2012, in the last 8 years in a CL and on World cup/Euros, all winners were quite similar and everyone were more direct oriented and with a cautious defense.
People will always reply: but but but, we won during Pep.
Yes, we won when we had prime Messi, Xavi, Iniesta, Busi, Alves.
As lots of other users mentioned over years, it seems that with our style or to be more accurate, with Pep's style=you can win ONLY if everything is perfect.
If your team is not perfect, it is almost impossible to win in Europe with that style.
Someone will reply: but but but, EV played your way and we still lost.
Let's say it that way:
Pep's style without prime Messi-Xavi-Iniesta=chances for a CL win 5%
Rijkaard's%Lucho's style without prime Messi-Xavi-Iniesta=20%