If you ask a senior rigger or TD why they keep a portable install of on their drive, they won't mention flashy features. They will mention Viewport 2.0 .
Using Maya 2018.5 today comes with risks. Because it is a retired product: Autodesk Maya 2018.5
Maximizing Stability: A Guide to Autodesk Maya 2018.5 Autodesk Maya 2018.5 If you ask a senior rigger or TD
Despite a steep learning curve, Maya 2018.5 remains a favorite for studios that require a robust, node-based system for high-end film and game production. Common Workflows in 2018.5 Autodesk Maya 2018.5