Universities key resource (even it top management sometimes seem to deny it) is their staff, you can tell a lot about shifts in activity by the character of staff employed across Higher Education.
In response to shifts in funding, universities are slowly moving more staff on to teaching only contracts while also reducing the number on 'full' academic contracts, (while also keeping more people on temporary contracts).
Its a further intensification of academic work.
@ChrisMayLA6 When I was a student, we were begging for more teacher only roles. The researchers were awful at teaching.
For a lot of the early stuff, having dedicated teaching roles makes way more sense.
Yes, ideally people would be good at both; I was more thinking about the shape of the university as an institution... that said, I always thought when I was a Professor, job no.1 was teaching (even then it was where the bulk of the money came from) and I found it, especially later in my career, the main joy of the job. But, many of my colleagues, as you suggest, were rubbish at it (as my students often told me so, when expressing a preference for my courses)
Emeritus Prof Christopher May
Alex Turff