RDR2 is a game that spent 7+ years in development and released with such advanced graphics technology because of several factors, such as:

The game was developed by Rockstar Games, a renowned studio with a large team of approximately 1,600 people and a high budget. Rockstar co-opted all of its studios into one large team to facilitate development and ensure quality and consistency.
The game was built specifically for the PlayStation 4 and Xbox One, which are eighth generation consoles with more powerful hardware and capabilities than the previous generation. Rockstar had tested the technical capabilities of the consoles when porting Grand Theft Auto V and used that experience to optimize RDR2 for the platforms.
The game used the RAGE engine, which is a proprietary game engine developed by Rockstar that has been used for several of its titles, such as Grand Theft Auto IV, Red Dead Redemption, Max Payne 3, and Grand Theft Auto V. The engine allows for realistic physics, animations, lighting, weather effects, and environmental details.
The game offered two different graphics APIs for PC users: Vulkan and DirectX 12. Vulkan is a multi-platform rendering API that is based on AMD’s Mantle API and can offer better performance and compatibility on some systems. DirectX 12 is a Microsoft-developed API that can offer better graphics quality and features on some systems. The game allows users to choose the best API for their system and preferences.
The game also used various graphical techniques and technologies to enhance its visuals, such as tessellation, ambient occlusion, anti-aliasing, volumetric lighting, global illumination, depth of field, motion blur, HDR, and ray tracing. The game also featured a dynamic weather system, a day-night cycle, and a realistic simulation of animal behavior and ecology24.
These are some of the reasons why RDR2 spent 7+ years in development and released with such advanced graphics technology. The game received critical acclaim for its graphics, among other aspects, and is considered one of the most visually stunning games ever made.
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