I think it's the same instinct as making your own Game Engine. You start off either because you want to learn how they work or because you think your game is special and needs its own engine. Usually, it's a combination of both.

I’m not an expert but I started with smaller tasks to get a feel for how to phrase things, what I need to include. It’s more manageable to manually fix things it screwed up than giving it full reign.

You may want to look at the AGENTS.md file too so you can include your stock style things if it’s repeatedly screwing up in the same way.

Purely as an exercise to see how they operate, and understand them better. Then additionally because I was curious how much better one could make something like qwen3.5-plus with its 1 mil context window despite its weaker base behaviour, if I was to give it something very focused on what I want from it

The Pi framework is probably right up your alley btw! Very extensible