Although the demand is high, robust large-scale Wi-Fi networks are very rare. No matter how much resource is invested, it seems large-scale Wi-Fi networks just do not perform.
Both directional and omni-directional antennas are required to mesh and provide subscriber coverage respectively. The narrow beam widths of directional antennas make them unsuitable for subscriber coverage and omni-directional antennas which propagate signal in a 360° pattern provide subscriber coverage but often feature low or no gain.
Due to the lack of gain, providing contiguous Wi-Fi connectivity requires many access point locations with omni-directional antennas. In addition to high costs, locating multiple omni-directional antennas close enough to eliminate coverage gaps creates other issues such as antenna de-sensing due to proximity and channel conflicts all resulting in the very common experience of poor performing large scale Wi-Fi deployments.
The conclusion is often that it is just not worth it.