IMO these maps are the primary reason for busted forecasts and I think they're hurting the meteorological community. They got tossed around left and right, the general public gets whiff of them and all hell breaks loose from there. I don't think they're 100% invaluable...they can certainly provide some insight as to where accumulating snow is more likely and perhaps they can pick up on mesoscale features like downslope.
I love that about bufkit! It's an incredible tool and very useful b/c if you have a storm where ratios vary you can gauge where to apply higher/lower ratios.