Shaking pickles weekly isn't strictly necessary, but it can help distribute spices and prevent sediment from settling, leading to a more uniform flavor throughout the jar.
When pickles are fermenting or aging in their brine, heavier spices and solids can sometimes settle at the bottom of the jar. This means the pickles at the top might not get the same level of flavor infusion as those at the bottom. Gently shaking the jar once a week helps to redistribute these elements, ensuring that all the pickles are exposed to a consistent concentration of flavor. This is especially helpful in the early stages of pickling when the flavors are still developing. However, be gentle! Vigorous shaking can damage the pickles. If you're using a fermentation weight, make sure it doesn't dislodge and damage the pickles. For commercially produced pickles, shaking is less critical as the flavor is usually already well-distributed during the manufacturing process.
When shaking your pickles, do it gently and invert the jar a few times rather than shaking vigorously. This minimizes the risk of bruising the pickles and clouding the brine.