I can't help but wonder if the OP was referring to the smoothness of trigger action, as there can be little to complain about in a rifle action that cycles quickly and effortlessly. The last thing I want in the field is a rifle that, with the striker released, twists in my grip when I attempt to lift the bolt handle. Bolt travel that feels gritty is nearly as bad, as is a magazine that gives up it's charges reluctantly, or positions the cartridge out of line with the chamber. So we see that smoothness, as it relates to cycling the rifle, involves a number of elements, the resistance of cocking the action and extracting the fired cartridge, the smoothness of the bolt's travel in it's raceway, and the suitability and geometry of the magazine.
As for the trigger, neither can it be too smooth, but problems can occur if it breaks with too little pressure exerted on it. Should your hands be cold, or should you be in a condition of excitement, the trigger might well break before you can feel it, if its adjustment is too light for practical use. Though not a safety concern per say, since its prudent to always, and without exception, observe good muzzle control, but it can lead to a missed, or wounded game animal, or simply to the embarrassment of an unintentional discharge.