I am also trying to sort this out, but I'm probably someone you'd consider to be on the other, "anti-LLM" side.
I wonder if part of this is simply level of patience, or, similarly, having a work environment that's chill enough to allow for experimentation?
From my admittedly short attempts to use agentic coding so far, I usually give up pretty quickly because I experience, as others in the thread described, the agent just spinning its wheels or going off and mangling the codebase like a lawnmower.
Now, I could totally see a scenario where if I spent time tweaking prompts, writing rule files, and experimenting with different models, I could improve that output significantly. But this is being sold to me as a productivity tool. I've got code to write, and I'm pretty sure I can write it fairly quickly myself, and I simply don't have time at my start up to muck around with babysitting an AI all day -- I have human junior engineers that need babysitting.
I feel like I need to be a lot more inspired that the current models can actually improve my productivity in order to spend the time required to get there. Maybe that's a chicken-or-egg problem, but that's how it is.