Even in jsx its not required to add a boolean value. Unless you are passing in a var as a prop in which case sure. But that didn't look like it was the case in these examples.
> Even in jsx its not required to add a boolean value
Absolutely true! But I like to do it because I personally think it reads more nicely and is more explicit and that's what I do in all my projects. But it is indeed a matter of taste and I have nothing against code that follows the convention to omit the "true" value.