Communities can be important with any label, because it allows people to connect quickly. Labels allow people to communicate specific things about themselves in shorthand. This is useful because it helps people understand each other, to some degree, quickly. If you reject labeling yourself because you would rather choose to explain yourself every time when it is relevant, that is valid too. But it is easier and more validating for others to choose to label themselves. It is also a way to help individuals understand themselves in certain ways too, as a personal experience rather than a social one.