The required capacitor may not be one, usually two or more capacitors are placed in parallel, the series inductance of the small capacitor itself, and then the impedance of the charging and discharging circuit of the small capacitor. Placement of capacitors, installation distance, installation method, capacitor selection and other issues.
Many chip manufacturers give this local decoupling method in reference designs, but it is not to say that this method is optimal. The chip maker is concerned with how to improve the performance of the specific device he provides, that is, the focus is on the device itself, and the problem of power supply decoupling is not dealt with from the perspective of the entire circuit system.