Seat down was very popular back in 70-80's where I live. Stock seat is rather thick with sharp corners.
Many did after seat was scratched when bike hit the ground. White the color in first part of 80's
I left my K6 stock seat to professional shop to cut the foam in a wave pattern for driver and passenger. Worked really fine, rounded shape and more comfortable than stock. They cut the foam and applied another foam on top of it with final shape.
Find an old seat in need of new cover.
My reshaped seat. The bike got later a NOS seat to complete the stock look it had then with 4-4.