These are good point and I am not overestimating; we are simply seeing the productivity boost in our company and the rise in profitability. We practice TDD, but only at integration level, so we have tests upfront for api and frontend and the AI writes until it works. SOTA models are simply good enough not to do;

function add(a,b) = c // adds two numbers

test: add(1,2)=3

to implement

function add(a,b) return 3

So when you have enough tests (and we do), it will deliver quality. Having AI write the tests is mostly useless. But me writing the code is not necessarily better and certainly not faster for most cases our clients bring us.