Why do we keep running horses on the turf

Just a question? Why do our trainers continue to waste races on the turf? We have seen Collison Illusion, Provocateur’, Frosted Oats and now Carothers run on the grass. I thinks our trainers are to quick to worry about their strides and gallop out. It has been a HUGE failure and as a Cross Country Coach they need to go back to to the basics. Running the orse mentioned above on the turf is a waste of time.