I'm confused by this comment? Obviously, nobody wants to get sick from any sort of shared common spaces (which buffets are most certainly), but with a dangerous virus with a high rate of transmissibility going around, people would understandably be more cautious or concerned about the tongs, pans, utensils and other tools they'd be sharing with other patrons to obtain the food as well as the physical layout of the process of obtaining food (i.e. how much space is between you and other patrons). If these locations remain "serve yourself," people also can understandably be worried about an asymptomatic child touching the food or tongs . This definitely happens at Disney. Just ask a buffet chef. For very, very serious food allergies, chefs ask guests if they can just prepare the food individually for that guest, because of this exact concern (a kid taking the tongs from a cheese-dressed salad and using them to grab other nearby cheese-free food).
As far as I can tell, nobody is raising concerns with food quality but rather the means of obtaining the food. Buffets as they traditionally operate can be problematic in that sense.