I understand the sport differently to you, yes.
I don't care about your understanding so much, but what makes me a bit sad is that Barcelona wasted close to 10 years of prime Messi and Busquets by first buying Neymar and Suarez and relying too much on them, and later to try to replace them, instead of focusing on what made Barcelona so great in the first place. It's also strange to me that those who are so "anti Barca-DNA" and "anti-tikitaka" can at the same time blame Rosell and Bartomeu so hard, when they did all they could to get away from Barca-DNA and tikitaka as the foundation. I'm sure most of you people were very positive to at least 2/3 of Dembele, Coutinho and Griezmann beforehand.
OK, this confirms my observation that you live in your dream-land. Don't take it personally, I don't want to offend you, there is no more polite way to put this.
But it explains why you are so sold on Xavi, who at best will try to replicate Pep's tiki-taka without realizing that a decade has passed since then.
No firm grounding on reality is the greatest recipe for disaster, and that's a reason Xavi should stay away from Barca until he baptizes himself well enough in the wild world of European football, and proves that he can get rid of his dogmatism and adapt his principles to current to-date football.
Everything in sport and in nature in general shall be constantly renewed or else it dies out.
Pep himself, presented the last 1.5 years the most defensive and cynical version of his football, because he knows that, and he is constantly adapting or else he would not be winning anything.
Look at the fate of poor Mourinho who is climbing down level after level, because he just cannot adapt.
Could Pep's tiki taka survicve after 2012 as it was played until then?
Probably no, and we saw that already with Tito, who was a big advocate, a pupil of Pep, and continued on the same lines.
Bayern thrashing was a rude awakening.
Then after some experimentation, Lucho was the one to find some sustainable way of playing that does not violate the values and principles of this club, but can be effective as well on the top level.
So, your revisionist reading of those years (until before EV to say the least) is totally off. What would have happened if your proposal was adopted, would be a steady and constant decline on the top of Tito's season on the same fashion, with the same weaknesses being exposed easier and easier. And the waste of Messi's years would be even worse than what you can imagine