Sounds like an OK default, especially since the "better" (in your opinion) way can be achieved by just adding "Don't try to keep backwards compatibility with ol

Sounds like an OK default, especially since the "better" (in your opinion) way can be achieved by just adding "Don't try to keep backwards compatibility with old code" somewhere in your reusable system prompt. It's mostly useful when you work a lot with "legacy code" and can't just remove things willy nilly. Maybe that sort of coding is over-represented in the datasets, as it tends to be pretty common in (typically conservative) larger companies.