The coaching staff of FC Barcelona under Tito, under Tata and the coaching staff of Spain under del Bosque are "blind" and you know it better. I got that. What else can I say?
The false 9 is not an end in itself though. It's a role that only a very very limited number of players can and should play, most notably Messi, and when we don't have those players available, I wouldn't use it at all. I know that currently, we're not really flexible up front to play with a real 9. But when we have to compensate for Messi's absence like we do now, we should at least play someone there who resembles that kind of player the most. That is Neymar and definitely not Cesc. I get your point about Neymar being crowded out in the middle and the tactics of using Cesc as a false 9 and Messi and Neymar (in order to avoid them being crowded out and muted in the middle) on the wing have worked well against Madrid. But other than that, it's Cesc's talent and a scoring position wasted. Also, Neymar did fine in those games he played as a false 9.
Of course we're all armchair experts in comparison with Tata, Tito and VdB, but then again, the false 9 is just fashionable now. Coaches try all kinds of players there; I'm sure you remember Löw playing Özil as a false 9, which makes even less sense than playing Cesc there. If coaches always got it right then every team should win the treble every season.