60 fps was never about the looks, but about the performance, someone with 60 fps will be so much better at a shooter than someone with 30 fps, even though looking smoother is a nice perk its not the main reason 60 fps became the standard
Except it does. 30fps on 240hz tv doesn't make it look like anything other than 30fps on a 240hz tv. 60fps would look like 60fps on a 240hz tv. Doesn't matter how nice your tv is, what response time it has, ect. 60 fps > 30 fps no matter what.