The post was not about how much to use but about how to measure the amount you will use.THIS IS TOO MUCH SUGAR FOR ME. Aria
I too have found too much sugar in most frostings and etc. Also, way too much frosting for the cake. Often I only use half of the frosting for a layered cake and have a lot of wasted frosting.
I usually will cut the frosting recipe in half for recipes like that