most meat doesn't taste like chicken. Beef, pork and chicken all have very distinct flavors. the meats that do resemble chicken often have a very mild flavor, like chicken does.
AND many veggies do taste similar. Sweet potatoes, pumpkin, winter squash and carrots all have a similar flavor and some folks cannot tell the difference between a squash pie, sweet potato pie or pumpkin pie. Leeks, shallots, chives and onions all have a similar flavor, only divided by how strong or mild that flavor is.