Would you say the same about something like, say, Spacemacs?

No, I don’t think I would. Filling the model’s context with a bunch of junk and actively making it perform worse isn’t the same as adding opinionated defaults/settings. The GPT-5.6 announcement just made it clear that these huge agents files are actually doing more harm than good.

If this just added skins or something I wouldn’t be arguing against it.

Oops. It wasn’t in the announcement, it’s in their Prompting Best Practices. I just noticed it because of the announcement.

https://developers.openai.com/api/docs/guides/latest-model#u...