I don't like the taste of fondant (and I have a huge sweet tooth) but I've still had lots of fondant covered cakes made for me, I just get it peeled off before it's served. You don't have to eat it.
It basically tastes like sugar that has been made into a paste, which is pretty much what it is...
Fondant covered cakes don't have to be heavy, you just need to practice lots. My wedding cake was amazing, and it was light and fluffy with from memory 4 layers of frosting in each teir of cake.
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