I think the SDLC needs to be re-evaluated, tests, specifically unit tests, are just cosmetics. "wow its so easy to get high coverage now!" as opposed to why we're doing it in the first place
I don't find agents to be using tests any differently than a junior or mid level developer. I don't find humans to be using tests any differently than a junior or mid level developer either.
Basically, the tests are never guiding the features, they aren't highlighting regressions, the test is simply modified for the updated application. Unit tests especially.
I have found end to end tests to be useful, and also unblocked. They can tell when the actual user experience has changed, and go back to the feature's implementation to stop altering the user experience in unexpected ways.
additionally, I find this across every industry that was worried about AI. basically, whatever best practice was neglected due to lack of investment into your org is now being done without additional investment into your org. that's a good thing. now we need to look at the purpose of the best practice, and if that purpose itself was already solved in the process.