Fixed or fixing the problem?
Fixed on mine, I don't have any issues when it rains. Being hypercritical I might get the odd drip from the top centre if it's hammering down with rain and I open the boot at the same time, but our other car with normal doors gets a LOT more rain inside - usually get the whole inside of the door soaked.
Interesting question about the front doors. The big advantage with the rear FWDs is when you have small kids as we do. No more bending when fastening them in and no more footmarks all over the door cards as they scramble in and out. Access is really amazing. But those advantages are not so obvious in the front and the overall complexity and weight is certainly an issue. So I think it's a pretty good compromise overall.
But you don't really care do you, lol.