Just a quick (I repeat, quick) stab in the dark at a work-around for the fun of it. Open to correction/discussion/ridicule.
I assume it was'nt sufficiently autoland capable (no need for a clear screen if it was ?) and the F/O was a moron and could'nt be trusted to ......taxy, basically ? Heck, forget that - best not to use wipers at all for fear of scratching the screen with the bent one - simply have a tug ready to tow it to stand !
I don't have manuals to hand, but they're not 747 anyway. Are wipers needed for full bells and whistles autoland ?
Obviously pick diversions with no rain forecast.
Hey, at least I'm contributing !