And it is not just about convenience. When you use JSX for updating a DOM, it brings about a significant improvement in site performance and leads to greater efficiency vis-à-vis UI development.
2. Virtual DOM
In the absence of ReactJS, your site will make use of HTML for updating its DOM. This does not cause any serious problem in the case of simple and static websites but when a website is dynamic and involves a lot of user interaction, this can become a major issue as the entire DOM will have to reload whenever a user clicks any feature demanding a page refresh.
But when a developer puts JSX to use for amending a DOM, ReactJS creates a Virtual DOM, which as the name suggests is a copy of the actual DOM and ReactJS uses it to see where all changes need to be made in the actual DOM when a user clicks a button and does the needful.
This type of selective modification results in less power consumption and loading time, which really makes a major difference when you take into account the dynamics of a complex website and the alterations that are made in it.
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