An example would be this:
Let's say you swing with a "full sweep release." Whether Zuback has one or not is unimportant, I don't want to get into that debate. Now, let's say with this full sweep release, you generate 125 mph clubhead speed. Pretty darn fast, right?
Okay, now let's say you worked with an instructor and you said, "Instructor, I want a snap release/crazy amounts of accumulator lag/maximum trigger delay. Teach me how." So let's assume you have a great instructor, we'll call him Mian Branzella. He figures, "Hey, if that's what this guy wants so bad, I'll teach him to do it." So you work and work and get your swing to where you have this nice Mike Finney/Sergio Garcia look of maximum trigger delay. You get excited and then step onto a launch monitor and swing away. And then POW, you hit one really good, look over at the numbers and . . . 120 mph. WTF mate?
Here's what (may have) happened. In generating this new swing with more accumulator lag, your hands had to slow down to accommodate for the new release. Or maybe your pivot speed lessened. And they had to slow down enough to where your clubhead speed at impact actually dropped 5 mph. I know what you might be thinking: "LOLsss, this guy doesn't know what he's talking about! More lag creates more distance!"
This is true, ceteris paribus. "Ceteris Paribus" is a phrase used in economics (among other things) to mean "all other things being equal." And in golf, more accumulator lag will definitely create more clubhead speed, ceteris paribus. But more accumulator lag may also affect other speed-creating elements in the swing adversely, creating less clubhead speed.
Make sense?