>Have the coding agents do the work of digging around hunting down those frustratingly difficult bugs - don't have it write code on your behalf.

Why? Bug hunting is more challenging and cognitive intensive than writing code.

Bug hunting tends to be interpolation, which LLMs are really good at. Writing code is often some extrapolation (or interpolating at a much more abstract level).

Sometimes it's the end of the day and you've been crunching for hours already and you hit one gnarly bug and you just want to go and make a cup of tea and come back to some useful hints as to the resolution.

Because it's easy to automate.

"this should return X, it returns Y, find out why"

With enough tooling LLMs can pretty easily figure out the reason eventually.

Why as in “why should it work” or “why should we let them do it”?

For the latter, the good news is that you’re free to use LLMs for debugging or completely ignore them.