Is one style enough? Or best to learn more?

A question that could arise from time to time, should one learn more than one system or is one system enough. If you only do one system, you maybe be seen has having blinkered vision not willing to explore or to see what else there could be. And if you do two or three other arts, you maybe seen as not understanding the potential in one art and could be trying too hard to cover in what’s in the others and spending less time in one art. What’s the answer? Long ago it would be quite right to practise only one art, seeing at a time when most arts would cover all potential fighting aspects from weapons to all unarmed fighting skills etc. This assumption would deemed fit if you lived in a village that was to be attacked by another army etc, that you would be taught relevant skills to achieve victory. But as time went on, fighting was not so much needed, skills died out, just leaving forms or dance like sequences. So much so that many may ask where do some of these fancy looking skills come from? surely they could not be taught by a master who wanted his village doomed by teaching useless skills. He had to teach proper so his village could survive. So an answer to a that question would be, yes its best to learn one art if it had all the skills needed to become combatant in all areas of combat. But seeing some arts lost certain key fighting skills and depending what has been lost then you must study those areas also. The next question to it all, can you afford the time to cover all these areas.