A move from Olympus Cameras.

This Christmas Santa delivered an A7iii. Actually, I got a good deal on it while stuck at Singapore Airport. Does this mean I am ditching my Olympus Em5ii forever? The M4/3 (Micro four thirds) system is flexible, lightweight, responsive and home to some great lenses. I am likely to keep the system as a high-end backup and a lightweight travel option. So why change systems?