Small shops and hobbyists may not have much use or space for a panel saw. Folks in the business can cut up 20-30 sheets of plywood regularly. With a panel saw, you don't have to lift the full sheet up, it's pretty easy to slide a full sheet on to the panel saw by lifting one end and sliding on to the carriage base. With a good blade and proper tuning, the panel saw can be dead on but some only use it to crosscut a sheet to a smaller size, then use a table saw for the rest of the cuts. The saw can be replaced with a router. Large shops use panel routers and equip the panel saw with pneumatic dogs, and stops. Awesome for dado work, either through or stopped dadoes, ploughs and rabbets, stops mean no measuring and repeatability which is very handy when you have 50-100 dadoes. You would soon be out of business if you had to clamp a straight edge to your work for each dado.
Non pros often think in terms of residential work. Many of us in the business seldom do residential work, it's mostly commercial, banks, schools, hospitals, resorts, museums, stores, etc. A bank can have 8-10 tellers counters or more, a reception desk, offices with shelving, desks, various cabinetry, the scope on a small bank can be the size of 3-4 kitchens, for example. That means a lot of material processing. Jobs are designed and specified by architects, often to AWI standards. You aren't typically making one cabinet and you do it day after day, year after year. When you process in volume, you need the equipment that can keep up with production, panels saws are an inexpensive option.