Differences between promises and callbacks is not the concern here. There are three options for asynchronous handling whether or not they are different under t

Differences between promises and callbacks is not the concern here. There are three options for asynchronous handling whether or not they are different under the hood and regardless if this is all just vanity. What Promise objects did Callbacks already did that. Its just moving one concern from an API to a method. Nonetheless the capability was already there natively in the language, which is called the event loop. In all things, even outside of code, people express vanity as an implicit means of advertising some manner of their identity or preferences. To the contrary people impose vanity on others only as a means of compensating for their own low confidence. Confidence is generally exceptionally low in software.