The purpose of greasing the dough (and the bowl) is to keep the surface of the dough pliable as it rises, not specifically to prevent it from drying out. The purpose of using cling-wrap over the proofing bowl is to trap the humidity. Both work to prevent the harm which occurs when a skin forms.
Cling wrap is less messy and generally easier than a damp towel. It is less green.
If you wonder how effective covering is in preventing a skin, it's easy enough to find out. Proof your next bread dough in two batches -- one covered and the other open.
BDL
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