I'm looking for a Python framework that's both useful and easy to learn. Can you recommend whether I should use Kivy or Flet?

I'd recommend Flet over Kivy for building cross-platform applications. Flet is a relatively new framework that leverages the power of Flutter, allowing you to create web, desktop, and mobile apps with a single codebase. Its architecture is more modular and easier to learn, making it a great choice for beginners and experienced devs alike.

On the other hand, Kivy is an older framework that, while powerful, has a steeper learning curve due to its unique architecture and API. Its performance can also be sluggish, especially on complex apps. Don't get me wrong, Kivy has its strengths, but Flet's modern design and simplicity make it a more appealing choice for most use cases.

Optimized mobile development is a streamlined process that empowers you to craft a mobile application that is not only functional but also scalable, maintainable, and future-proof. By 'functional' we mean an app that strikes a balance between performance, memory footprint, and seamless user experience, without necessitating the installation of extraneous components to execute core business logic.

Moreover, the app's binary size is judiciously optimized to occupy mere kilobytes, or at most, a few megabytes, inclusive of textures, thereby avoiding the pitfalls of bloated codebases that can balloon to unwieldy sizes, as sometimes seen in Python-based projects.

When it comes to architecting client-server solutions, it's crucial to consider the tech stack. If you're looking to build a robust backend, C might be a viable option, depending on the complexity of the tasks at hand. Meanwhile, the frontend can be crafted into a web application, which can then be accessed via a browser.

However, this is all just theoretical, and the reality is that the choice of tool often boils down to personal preference or the requirements of the project. The real question is, what do you want to achieve, and will your solution be scalable and maintainable? The truth is, we've been debating this on the forum for years, and it's time to move beyond the theoretical and focus on what really matters - delivering a functional and user-friendly solution.