The 2019 release introduced several industry-standard tools that remain popular today for their stability and performance on 64-bit systems:
Optimized for 64-bit architecture, this version improved zoom responsiveness and file opening speeds on high-resolution displays. System Requirements for 64-Bit Installation
To run Illustrator CC 2019 smoothly on Windows or macOS, your hardware should meet these minimum specifications: Adobe Illustrator CC 2019 BEST NEW FEATURES
A major shift from linear and radial options, allowing users to drop "points" of color for more natural, photorealistic blends.