> All you have to do is read the datasheet

Have you read many datasheets? Parsing a datasheet can be pretty complex, even if it’s well written (of which many are not). There’s quite a few figures spread across many sections, and a beginner might not even realize they should be looking for the absolute maximums section. Sometimes datasheets aren’t even that explicit about certain failure modes, you could lock up a logic chip by accidentally leaving a pin floating, for example.

I can certainly see some value in a breadboard with instant feedback for when you’ve fucked up. Ideally you’re using a power supply with an adjustable current limit to begin with but this is a cool way to quickly draw your attention to an issue.