1-2 times feeding a month on an adult snake is fine and pretty normal, there's no reason to be feeding weekly at that age and you don't want your snake in constant digestion mode. Hatchlings/baby snakes get fed more frequently and you slow down feedings with age. Keep in mind almost all pet snakes are overweight and it's very bad for them. My adult balls get fed every 2-3 weeks. The no soaking I think is more because so many people have bad setups and counter the shedding issues by throwing the snake in a tub all the time, it's stressful and dangerous for them if you screw up temps or get water in their lungs type of deal. Easier to encourage proper husbandry, the humidity should stay high and steady.