What is a common grilling mistake to avoid?

Flipping meat too frequently is a common grilling mistake to avoid because doing so can prevent the meat from forming a proper sear, which enhances flavor and texture. When meat is flipped constantly, it does not get the chance to caramelize and develop those desirable grill marks. This searing process not only provides a nice crust on the outside but also helps lock in juices, resulting in more flavorful and tender meat. Allowing the meat to cook undisturbed for a sufficient amount of time before flipping helps achieve the best results.

In the context of the other choices, while they all pertain to common grilling practices, they do not directly address the fundamental techniques that impact the quality of the meat as much as flipping too frequently does. For instance, using too much marinade might alter the flavor or moisture level but doesn't impede the cooking process directly, cooking on a too hot grill can cause burning rather than promote even cooking, and not preheating the grill can lead to longer cooking times and less effective grilling overall, but none of these mistakes affect the searing process in the same critical way that frequent flipping does.