You can look up photos of the typical appearance of melanomas on a dermatology Web site, but that does not substitute for having seen and followed thousands of moles. It is years of experience that teaches us when to worry and when to reassure. Young doctors, fresh out of training, are almost always the most informed. They are up on the latest literature. But they are also prone to excesses more than seasoned doctors precisely because their knowledge is not backed up by gut feelings born from experience.
Experience is no substitute for hard fact.
And raw facts without the experience to interpret them can create the illusion of knowledge, but contain no underlying wisdom. Experience and facts. We need both. Web sites cannot provide experience. But then again, an ill-informed doctor's experience may not be enough.