I think the wipers are a fair criticism, they work fine in the rain for me, but I do get the odd single dry wipe, more so when the screen is dirty, but enough when it's not to know it's not perfect. I see a lot of people and video evidence of them not wiping correctly. I do believe they are doing testing and there are various sensitivities out there, which accounts for the varying experiences.
I am confident they will resolve it, I think if they can't in the near future they are going to have to admit defeat and take a different approach, but I honestly don't believe it will come down to that.