I'm surprised this isn't a big enough deal that Tesla would come up with a solution. It's a biggie for me that really lowers the enjoyment of the vehicle since it's very tough to get out of the car without getting some of the muck on your pants. And I live in relatively sunny California... if I were in a climate with snow and slush and long seasons of muck, I'd be extremely upset about this.
I was at Tesla MP today for other service and asked Johnny in Service, and Dave the technician. Both say that it's an issue that's well known and that unfortunately, Tesla does not intend to address it.
But I'm thinking if enough of us complain... maybe?