I don't think this is how pro and anti conversation goes.

I think the pro would tell you that if GCC developers could leverage Opus 4.6, they'd be more productive.

The anti would tell you that it doesn't help with productivity, it makes us less versed in the code base.

I think the CCC project was just a demonstration on what Opus can do now autonomously. 99.9% of software projects out there aren't building something as complex as a Linux compiler.