Operating system: Windows 10 Pro
Graphics card: MSI GTX1080 Ti
Blender 2.79 and before
In 2.79 when you select axis during an edge extrude by using the middle mouse button the default axis was Global. In 2.8 this was changed to Normal thus making it almost unusable.
Here's a youtube video showing the exact problem
My proposed way to fix this issue would be an ability to select the Transform Orientation (Global, local, normal etc.) you want the extrusion to occur on or at least bring back the Global Transform.