> There absolutely no reason that AI written code can't or won't become battle tested.

I can think of 2:

1. Low trust: I'm not going to trust some rando's AI-generated code/PR when I can make my own AI generated code. Maintainer will (rightly) not trust my awesome AI-generated PR because I'm a rando to them.

2. Fragmentation, if a lot of people are doing (1), they wont contribute to the same upstream codebase like they would in the past, which means each codebase only runs through a small subset of potential environments.

The interplay between 1 & 2 will result in a lot of siloed code, with no accounting for taste (i.e. sensibilities developed by maintainers)