For the most part, we operate within fairly expansive bands of tolerance for perfusion, oxygenation, ventilation, and drug responses without causing major organ damage or death. It is possible to use only one technique in anesthesia, become proficient in it, and use it for 99%+ of all your patients, without harm. But the finesse (and fun) in anesthesiology is to develop an ever expanding toolbox acquired over the years, in order to select your best choice for the patient. With any new tool you add, there is a steep learning curve, but with practice and study, the novice inadequacy complex rapidly dissipates.