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The tiki-taka strategy that Xavi always developed when he was at Barcelona is indeed very useful for breaking down defenses because it applies excellent teamwork and utilizes speed and accuracy to advance against until finally to the goal point will be executed to score goals. So far with that strategy they have always managed to break down the opponent's defense.
The tiki-taka strategy is an integral part of Barcelona, Xavi is very easy to apply Tiki-taka in Barcelona because as long as Xavi is still actively playing, he has always been the spirit of Barcelona game. Xavi role as a coach can give Tiki-taka more life because in the era of Ronald Koeman Tiki-taka was not seen anymore.
Xavi has succeeded in adopting Tiki-taka in a player who has just joined Barcelona, a more modern style of play with one-twos and occasionally supported by crosses that trouble the opponent's defense.
This is the difference between Koeman and Xavi because indeed we know that nowadays the Tiki taka that had been the hallmark of Barcelona during the golden era slowly faded in the Koeman era and now they have re-implemented their current strategy since Xavi was at Camp Nou.
Now with the current tiki taka it will clearly make Barcelona stronger even though at this time it can still be said to be a transition but still their performance has improved greatly.