The author of the Fly UI Beta texture package believes that the interface in the game is poor and crooked. Therefore, he decided to make his version and offered it to us. Therefore, update the design of the game in a modern way and evaluate for yourself.
As you probably already understood, this texture pack will only change the interface in Minecraft. The innovation will replace the design: the main menu, the settings menu and other secondary windows of the game. It is worth noting that the improved version looks neat and aesthetically pleasing, therefore an option for those who want to refresh the game.
In the future, the author wants to release an improved texture pack that will affect not only the interface, but also other aspects of the game.