JavaScript frameworks have undergone a remarkable transformation since their inception, evolving from niche tools used by a select few developers to essential components of modern web development. In the early days, frameworks like jQuery emerged to simplify DOM manipulation and enhance user experience. However, as web applications grew more complex, the limitations of these early frameworks became evident. This led to the creation of more robust solutions such as AngularJS, which introduced a structured approach to building single-page applications (SPAs), allowing developers to create dynamic user interfaces without reloading the page.

As the demand for efficient and scalable web applications surged, a new wave of frameworks emerged that further revolutionized JavaScript development. Notably, React introduced a component-based architecture that enabled developers to build reusable UI components, promoting a more maintainable codebase. Additionally, Vue.js gained traction for its simplicity and flexibility, making it accessible to both beginners and seasoned developers. Today, frameworks such as these dominate the JavaScript landscape, reflecting a shift towards modularity and efficiency, making them indispensable tools for developers aiming to create high-performance web applications.

The success of a JavaScript framework can be attributed to several critical factors. First and foremost, community support plays a pivotal role; frameworks that foster a vibrant community tend to grow more rapidly and attract developers eager to contribute. A strong community not only provides extensive libraries and plugins but also offers a wealth of tutorials and forums for troubleshooting. Additionally, the framework's performance and scalability are essential. A framework that consistently delivers fast rendering times and can handle large-scale applications is likely to gain traction among developers who prioritize efficiency.

On the other hand, certain aspects can lead to a framework becoming obsolete. Stagnation in updates and lack of innovation can alienate developers; frameworks that fail to adapt to new web technologies or that do not embrace modern development practices tend to fall out of favor. Furthermore, if a framework becomes overly complex or difficult to learn, it may deter new developers from adopting it. In conclusion, the lifecycle of a JavaScript framework hinges on its ability to evolve with the changing landscape of web development, supported by an engaged community and consistent enhancements.

As we delve into JavaScript frameworks in 2023, it's essential to highlight the frameworks that are currently making waves in the development community. React, with its robust ecosystem and strong performance, remains a dominant player. Additionally, Vue.js has gained popularity due to its simplicity and ease of integration, making it a favorite among beginners. Conversely, frameworks like Angular have seen a decline in enthusiasm as developers lean more towards lightweight options that streamline the development process. Areas such as server-side rendering and static site generation are now heavily influencing choices, pushing developers to explore newer frameworks like Next.js and Svelte.

When discussing what's not hot in 2023, it becomes clear that certain legacy frameworks are falling out of favor. For instance, frameworks that prioritize complexity over performance, such as some older versions of Ember.js, are being left behind as many developers seek agility and simplicity in their projects. Furthermore, the rise of micro-frontends is reshaping how applications are built, allowing for independent deployment and scaling. This shift indicates a broader trend toward modular and flexible architectures where traditional monolithic frameworks may struggle to keep pace.