Most vegans don't stop eating meat because they don't like the taste of meat, they stop because they're opposed to it ethically. So if you could get the same taste but without the cruelty then why not? It's also easy, especially if you're not an adventurous cook - just swap mince for quorn mince in your favourite recipe for example, it makes veganism much easier to maintain. Plus, unless you're literally making a whole fake chicken or something, most meats that "fake meats" are based off of aren't natural animal shapes. Cows don't come in the shape of a burger or sausage, it's just a convenient shape for eating.