As someone who went to a top-4 CS uni, there is nothing wrong with this. The professors who are co-authors on over 40 papers head their own labs. They have mult

As someone who went to a top-4 CS uni, there is nothing wrong with this. The professors who are co-authors on over 40 papers head their own labs. They have multiple groups of grad students / postdocs working under them, mostly independently. These professors are typically more hands-on in directing the research of the early PhD students. This is actually the ideal situation for a late-stage grad student / postdoc. They are somewhat free to pursue their interests while the professor deals with getting funding and resources. They are also better prepared for independent research if they want a future postdoc or faculty role. This is also ideal for professors: they are incentivized to train PhD students to eventually become independent researchers, because they get their name at the end.