Been back to flats some time ago. Went back to flats when I started to have pain mountain biking with clipless. I have Shimano Saint for the mountain bike and like the concave fit. The Saints are now on my road bike and I put a pair of Crank Bros stomp 7 on the mountain bike and like the large platform.
My knees are shot and clpless started bothering them so not sure if I will go back after knee replacement in the future.