I do it, because it's easy to do on my Grizzly and it's what the manufacturer recommends. Is it necessary? Hard to tell. Manufacturers recommend all sorts of things, not all of them required. Like using two people to lift a band saw onto the stand (should have listened....)
But - Grizzly makes "value" tools. Not the best, not the cheapest, but usually the best value. If they decided a quick release handle was a good thing on a value tool, it is probably important.