Pros... Get the job done faster and make more money.
Con's cut across the wood fiber with too much pressure or stop in one place and get sued losing all your money, house and reputation.
Suggestion, Do it the correct way with no shortcuts and make a pile of money. Most of us would agree that on larger decks there is more flat work. Flat work is much easier to clean than railings and is usually easier to seal so what's the problem?