I've talked about this in a few places, but there is a simple way to get to higher testability and trust in the automated tests being done with little to no ext

I've talked about this in a few places, but there is a simple way to get to higher testability and trust in the automated tests being done with little to no extra effort for complex systems — this slightly tunes how you define the testing pyramid, but it's important to always test exactly enough, or you hit maintenance burden that kills you down the line. All it takes is for a component developer to build a fully functioning component by having proper fakes for all the external dependencies. If this is religiously applied through the org, then all components in the org will have all of their real business logic and integration points sufficiently tested. Then, your end-to-end tests can work against a very complex system that is extremely fast, but which uses the actual business logic, other than the very extreme boundaries to external systems not under your control. However, AI is usually not much of a help here, because most software is not written in the way to easily construct either a fake or real production component from the same component — and AI is trained on existing source code.