These guys are right. Even in NRA registered matches the Match Director has the option of allowing shooters to shoot from the bench. I myself have what is laughing ly referred to as a “cripple card” from the NRA that allows me to shoot laying on a cushion. I got arthritis in my upper back and I can’t raise my head up high enough to get behind the scope when prone. Go shoot sir. You don’t have any particular advantage from a bench. Most F-Class shooters prefer to shoot prone because they do better that way. Go shoot.