The bottlenecks today are:

* understanding the problem

* modelling a solution that is consistent with the existing modelling/architecture of the software and moves modelling and architecture in the right direction

* verifying that the the implementation of the solution is not introducing accidental complexity

These are the things LLMs can't do well yet. That's where contributions will be most appreciated. Producing code won't be it, maintainers have their own LLM subscriptions.