I don’t understand what you are asking. I drive in very rainy Miami and I haven’t had an issue, but not much mud here. I do have a rear wiper and the mirror can be switched to analog.
Apologies, I didn’t grasp that the Luce didn’t have an actual rear view mirror, the kind with mirrored surface. I couldn’t find any pics online. My Hyundai I5’s just flips between analog and digital with a pull on the housing. So does my brother’s Blazer EV and my dad’s Lexus TX, this isn’t new.
I’d think lacking an analog mirror would run afoul of some regulation, but then there’s that Polastar that doesn’t have a rear window:) Cheers.
(Personally, I didn't know that was a thing, but I do know people in older cars buy rear view camera mirrors where they replace the analog one).