What on earth makes you think that you can't adopt this exact approach with agentic coding??
This is like saying that you shouldn't drive a car around suburban streets, because the maximum speed it can do is in excess of 250 kph. You absolutely can (and arguably should) take agentic coding slow and steady, and build software the way you always did. Like using a car to get to the shops at 50 kph, you'll still get there much faster than if you walk.