This is great advice. One of the things the Pro recently advised me to do was this. I was over coiling causing me not only pain but crap contact. Looking at those "half swings" they really weren't. I often see guys at the range overswinging by miles.
A few decades ago, I got caught using a "Lady Precept" ball by the authorities. The authorities be our group of golfing friends..
I was tried, and convicted at the 19th hole by my peers.. I was fined 4 pitchers of beer. Luckily Alcatraz had already been closed down before my misdeed.