i'm not talking about so it could be neat and nice looking.. i mean is it necessary for hair to be brushed everday anyways? it is mandatory? does it help hair, scalp and hair growth?

of course not.
think about cavemen.
i mean, we evolved from them.
we turned out all right.

If you have curly hair, brushing it will only frizz it out so I recommend you brush it before getting in the shower. Brushing your hair before washing it helps release loose hair and enables a better cleansing too. It helps with circulation of blood flow in the scalp, which is good for hair growth. Good circulation is essential in keeping hair follicles healthy, which helps keep your hair on your head! Brushing long hair keeps it tangle free too, just common sense.