Kudos to the kind soul who advised you. I too have several years, hours and miles of experience with quads dating back to the first generation Phantoms. I have always done the calibration dance before each day's flight regardless of instructions of indications that one was not needed (on the Mavic). It can't hurt as long as you follow the obvious precautions to avoid standing too close to metal objects, etc. I never mess with the IMU calibrations unless that need is suspected or indicated. As a general aviation pilot, I can't imagine ever taking off without setting the compass to either the magnetic compass or a GPS based compass. As far as "doing the dance, if nothing else, it makes people look at you funny. I live in Austin and we are PROUD of it, and it's even part of our motto "Keep Austin Weird".
Here's an example of how weird Austin can be. This is Leslie, he IS a "he" (obviously) but never dressed like a man. It was NOT unusual to see him strolling down the street wearing a THONG and bikini top (NOT a pretty sight). He was a fixture in downtown and south Austin for many, many years (homeless for most of them) and even ran for mayor and received a TON of votes. Passed away several years ago. There was even a set of refrigerator magnets available so you could "dress Leslie" in a variety of cross-dresser appropriate outfits--I still have one. You've got to admit, that's weird.
And if life in Austin sounds fun, it is. Even if you don't think it does, here are more reasons why it will change you forever:
BuzzFeed - 42 Reasons Living In Austin Ruins You For Life
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Here is a copy of my pre-flight checklist:
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