I prefer BIAB to Plugin for many reasons, not worth of mentioning in this topic. Here is what AI says:

"While Delphi is not necessarily associated with the latest cutting-edge UI design trends, using its FireMonkey framework, custom styles, and third-party components can help you create a modern, attractive GUI. The key to modernizing your Delphi GUI is using clean layouts, responsive design, and smooth animations to ensure your application feels contemporary and intuitive."

"Delphi's FireMonkey (FMX) framework allows for the creation of cross-platform, modern UIs that work across Windows, macOS, iOS, and Android. FireMonkey supports the use of custom styles, vector graphics, and rich animations, enabling a modern look."

"Use modern design patterns: Consider using flat UI design, minimalistic color schemes, and large typography. These are key characteristics of modern UIs. Responsive layouts: FireMonkey allows for responsive design, meaning you can create UIs that adjust to different screen sizes and resolutions."