Every team will be lucky back then if they had converted their chances too?

Arsenal also beat Barca whether they had tiki-taka or not at Emirates stadium then losing to them the following 2nd leg.

No actual solution to beat tiki-taka but more like if u have good players like Messi and Xavi to start the move or your luck in converting chances.

When AC Milan play defend against Barca at Nou Camp, they had only 2 chances and they converted both especially the Pato one