An alternative to protect the Mavic 3 during rain is to get a wetsuit accessory to keep some of the water away.
Like most any global navigational satellite system these days, the Mavic 3 contains multiple receivers for different satellite positioning systems.
Compared to the O3, which gets an ideal range of 12 km with 1080p 30 fps, it is a good upgrade.
Sample image from Mavic 3 main camera, Auto Exposure.