It's a bit of a repudiation of what at the time in medieval India was becoming a more and more rigid caste structure. I look upon all creatures equally. None are less dear to me and none more dear. And it is also very inclusive. It is not saying that one needs to only worship Vishnu or only worship Shiva. Those who worship other gods with faith and devotion also worship me. Not a fixation on being absolutely true to all of the rituals and the Vedas.