I'm intimately aware of how the system works both from my time in school and as the husband of a doctoral program professor who frankly wastes half of her time, energy and a lot school funds on what I see as pennie ante research topics in order to advance in her position in the university and for the prestige of publishing. I know she could handle a lot heavier teaching load and probably be a better teacher if she spent that time on the actual material she's teaching. Her program wouldn't need nearly as many staff, either, if they all carried a reasonable load.OK, I know some people in that system as well as CSU.
Universities produce new knowledge. When you talk about the US as a superpower, you talk about innovation, new knowledge not the number of nuclear warheads (for example, Russia has more) etc. UC system is the largest state university system in the US, according to some; according to others, it is California State, so it is at least second. But research wise, it is by far the most productive. You have numerous professors who do not teach at all! Why? Because they buy out their classes. When UC system employs professors, the schedule is 2 classes per semester; SOME very heavy research departments are 1 class per semester (however, research expectations are extremely high). What do some professors do? They get grants and then buy a class from the university so they can research. Basically, they pay back the university so that they do not have to teach. But you have to get a grant to have money. Some people are really good at that (check how many Nobel laureates in chemistry, physics, and medicine UC system has) and those grants support staff. A professor cannot conduct research without staff support bcs. grants, ESPECIALLY federal grants, require a ton of paperwork, checks, audits, etc. It is easier to get parole for murder than to get vetted for an NSF grant. So, when one receives a grant, there are two types of costs: direct and indirect costs. Universities take a portion of those grants and fund staff, scholarships for students who don't have money, electricity, cleaning, water, sewage etc.
So, a professor who buys out classes for several years bcs. he/she works on Webb telescope etc. might be actually funding 10-20 scholarships, staff etc. Also, a lot of researchers are really, really bad teachers. Their heart is in research. Then you have professors who are really good teachers and OK researchers. They typically teach 2 to 3 classes per semester at the UC system and often carry summer semesters on their backs, teaching 2-3 classes (for additional pay).
My point is, you really don't want to make really good researchers to teach, if they don't want to. But their contract involves teaching. If they don't teach, that means they bought out those classes, employ research assistants, provide money for scholarships, support staff etc.
The worst offenders are in the so called social sciences. So, so many billions of dollars wasted on "studying" race, class, and gender adjacent topics.