Whether you work the public or need internet to many employees, you will need superior equipment and infrastructure if you want a reliable system that doesn’t consistently slow down or stop.
Everyone has had times where the WiFi doesn’t work or is unbelievably slow, this is usually caused by poor hardware or 1% of people abusing the network.
With suitable equipment you can increase the range, speed and reliability of your system and combined with QoS (Quality of Service) software can limit those who take advantage.