Different emphasis. The goal is to quickly be able to see just the important, executed methods for a given request. E.g. you may have a 2,000-line User model,

Different emphasis. The goal is to quickly be able to see just the important, executed methods for a given request. E.g. you may have a 2,000-line User model, but Call Stacking allows you to pinpoint, "Oh, only these three methods are actually being called during authentication. And here are the subsequent calls that those methods make. And here's where the logic change occurred."