While some have argued for an end to the concept of species, replacing it with some kind of code for every organism, our minds readily see that there are natural groupings of organisms, and the species concept helps us rationally manipulate what we see naturally. This is true no matter how hard it is for a universal species concept to be devised.
Work Step by Step
Think about ways that you naturally notice patterns: in the numbers on a license plate, in pencils in a jar, etc. Our minds are made for order, and the idea of species helps us use this need in organizing and rationalizing the biological world.