In the old days, camera's worked with different sizes of film. You had 36x24mm, being a 3-2 ratio, you had 4x5 inch, being, yes, 4-5 ratio, you had 6x6,...

So try to get the composition in your viewer is a personal choice, absolutely free and often very rewarding. But it is not a law: it is a choice.
Some people love to see all their kids being dressed identically, some don't. Some schools, like armies, have uniforms, which helps to supress individuality and choice, and some don't. There is no rule that says that you have to do this or that. Most works of genius, be it in science, art, philosophy, even religion came into being because someone did not respect the existing compromises.
In sports, we humans always try to set new landmarks, break existing boundaries.

Inside all of us, we have that little rebel child, that voice that wants us to claim our birthright, namely to be free, each day, and twenty-four hours a day. And it feels good to, at least now and then, break free and simply be the creative genius we were all born to be, but whom we suppress because of everyday, practical purposes.

Like the great Moghul Emperor Akbar wrote (Akhbar was a very religious man): I find it very positive when man tries to create something. In confronting the limits of his creation, he will start to philosophise and be more conscious about the worl he is living in, which leads him; ultimately, to the source of creation of the whole Universe.

Making photographs does make one more conscious, more alert. It can open eyes you haven't used before, it can open doors of perception that untill that moment were closed.

Don't close the door of a self-chosen prison of rules and regulations, don't lock yourselves in. Be free when you create, feel life inside and around you.
And dare to question everything. It are only pixels on a memory card (or some chemicals on a strap of cellophane) and you can make very important discoveries.

I feel this is important.
To me at least.

There are no Borg. All resistance is fertile.