Almost never. I can normally see what's going on by only pulling 2-3frames, if I find something that concerns me I will dig deeper but, its not normally required. Check food stores, check for eggs, make sure young larva is nice and white healthy looking, check capped brood make sure it looks healthy no perforated caps. Check for swarm cells during swarm season. That's really about all I need to know most of the times. When you are first starting out doing a more detailed inspection will help you learn what's going on in the hive. But, once you get the basics down it's not normally required. Now I'm not saying ignore the brood nest, I'm just saying you don't have to pull every frame to know how the hive is doing.