> If you think like that why invest in software at all; the AI will do everything?
Correct, hence the "SaaSpocalypse" phenomenon in recent weeks. Investors are slowly becoming disinterested in investing in software anymore precisely because models are good enough now to replicate any SaaS pretty easily, which still requires effort but is less so than paying for a SaaS particularly in large organizations which are charged per seat.
The whole concept of PR is that you want additional looks on the code, and multiple agents working adversarially on PRs with philosophical rules are really nice.
Does AI make reading or writing stacked PRs any nicer? No, it does not.