Out of curiosity, have any of you who shoot LF ever contact printed color?

I was thinking, If i got filters like these and shined them on the contact printer, I could contact print a color negative or slide on to R-4 or Ilfochrome paper respectively.

It's just that, I see these large formats sheets of print and slide still sold for color and I'm wondering how in the World they're still being used.

I'm guessing that most of you guys get your slide or negative (process your own?) and then flatbed scan them and print from there.