Disadvantage is that creating a new function on every render ruins performance optimizations like `React.PureComponent`. Although that's a pretty minor detail,

Disadvantage is that creating a new function on every render ruins performance optimizations like `React.PureComponent`. Although that's a pretty minor detail, (you shouldn't prematurely optimize, and sometimes PureComponent is actually more expensive than rerendering since computing whether props have changed can be more expensive than just rerendering.)