Keep in mind that it be be true that CI/CD engines are an awful idea (for some people and orgs) while at the same time that CI/CD engines are needed (for some people and orgs). Not everyone can spin up Jenkins on a cheap VM, write scripts to do a build, and most importantly maintain it for years.

You can't hire people with experience on your homegrown scripts. You can hire people that have experience with a commercial CI/CD engine. Having worked on projects that used homegrown scripts, I can attest to it ending poorly and blowing just as badly as a CI/CD engine can end things poorly.