The false nine had its definitive moment in the 2012 Euros, when Spain dismantled Italy 4-0 with Cesc Fàbregas playing the role - no recognised striker, total positional chaos for the Italian defence. That performance was the high-water mark, and also the moment every average coach decided they understood the concept well enough to copy it. They didn’t then, and the current revival of the idea across European football suggests they still don’t.
The false nine only functions when the players running the channels behind it are genuinely willing to attack depth - and when the central midfielder behind the striker can carry the ball into vacated space at pace. Without those two things, you don’t have a false nine system. You have a team without a striker.
What clubs keep deploying instead is a technically gifted attacking midfielder shoved up front with instructions to drop deep and link play. That part they get right. What they miss is the next step: the system demands runners who time their movement after the false nine drops, exploiting the moment the centre-backs are forced to make a decision about whether to follow or hold. If the wingers aren’t making those runs - if they’re tucking inside looking for the ball to feet - the whole mechanism collapses. The defence never has to choose, so they never make a mistake.

Barcelona in 2008–2012 worked because Iniesta, Xavi, and Messi all understood spatial exploitation at an almost unconscious level. The system was built around a very specific type of collective intelligence. Most clubs attempting a version of it now have one player of that quality and eight who are being asked to interpret a language they’ve never spoken.
There’s also a pressing problem - literally. The false nine relies on winning the ball high, which demands a pressing structure that starts from the front. A false nine who doesn’t press aggressively when out of possession is just a passenger in an advanced position. Several managers currently using the shape seem to regard pressing as optional, contingent on the scoreline. That’s not a tactical system. That’s a way of managing a difficult player’s workload.
The shape itself isn’t flawed. Pep Guardiola proved that comprehensively. But it is unforgiving, and the current wave of false nine experiments across the Championship, the Bundesliga’s mid-table, and La Liga’s smaller sides mostly reads as managers chasing an aesthetic without doing the mechanical work behind it.