Add enough and your sails will look like something from a wind tunnel lab. Yes, you can do well through experience and looking at the shape of the cloth, but they do remove some of the guesswork from sail trim. I've been doing this for over 40 years and I still appreciate a full set.
The main leach tell tales can suck around behind the sail intermittently at the top when trimmed for peak power. The jib telltails should never suck back. Jib stall is worse than main stall since it will reduce the flow over the main.
The 
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