Did Diocletian's Reformed Legionary Formations Break Down?

The old legionary deployments neither spread the roman forces out enough to effectively monitor the frontier, nor concentrated enough force in one area for them to overwhelm their new larger opponents. But diocletian's reformed legionary formations would actually flow from a different tradition. Smaller and faster than a standard legion, they could be bunched together when a concentration of forces was needed,. And kept spread apart when the danger had passed and frontier wide surveillance was needed. Diocletian knew all about how these vexilation units functioned and how much flexibility they gave commanders. When he took power, he aimed to make their status official.