It takes talent to pull away the tiny tidbits of meat that cling to a quail's delicate bones. Pizza and long pastas can also test the dexterity of your guests. Make sure your diners don't need to struggle or acquire new skills to consume their meals. The less effort your guests must put into eating, the more they can focus on the conversation or the business at hand. Many people have medical conditions that affect their ability to eat certain foods.
Dentures are just one example.
In general, avoid foods that are hard to chew or especially sticky. When foods splash, splatter, and drip on shirts, blouses, and laps, diners get annoyed, embarrassed, and stained. Not only will this make them unhappy, it will also make them less presentable. No one wants the camera to zoom in on the keynote speaker only to reveal a big blotch of barbecue sauce on a white collar. Overdressed salads, soupy sauces, long pasta, BBQ, pizza, foods sitting in broth, and unwieldy giant lettuce leaves are common culprits.