I want to go a layer deeper since everybody are just talking about stats, skills and proficiencies.
In fairy tales the exotic races represents aspects of humanity being enhanced. Elves are the more gracious ones (Tolkien) or enchanting ones (folk tales). Halflings like peace and coziness, goblins are evil tribal mobs, dwarves are stubborn and like like shiny things of the earth, etc. What does humans represent then: Exactly what they are: Humans. Like human beings in real life they can be good or evil, strong or weak, etc. or a little bit of everything. Instead of looking into what makes a human special you should be looking into what makes a human normal. The +1 you get in EA is not a bad representation of the multi-capacity of humans, but perhaps even better would be to allow humans to distribute points as they like (up to 20 in a stat), while other races would have some limitations and extensions (min/max) to their stats. Imo though all this with the stats, skills and proficiencies are minor issues compared to the legend surrounding races and the roleplay of your character.
