It’s really only in the software bubble where people are able to prove themselves to break into it, due to various factors including engineers being in very short supply relative to demand for over a decade now. Sure nobody asks for my grades now that I’ve been out of college for a while, but they still look at where I went to college (based on high school achievement) and my first job (based on college achievement) and subsequent jobs (much easier to get because of where I worked at my first job), etc.
I just see this argument as very tone deaf because there are hundreds of millions of us regular people out there, and academic achievement is the most surefire way to get noticed and be given opportunities if you aren’t lucky enough to come from an important/influential family.
It’s not only about the grades themselves but how they pipeline the rest of your career and credentials. Rich people can shmooze and scheme to get some of those credentials and opportunities for their kids without the grades, but not us regular folk.