I think what a lot of people are underestimating is just how terrible most laptop webcams and cheap off the shelf webcams are in terms of image quality. Spending a bit on a half decent webcam can get you probably 85-90% of the way towards what you can get with a DSLR.

As someone who has actually used both setups, the DSLR setup was great but a pain to manage. Just for simplicity of my desk setup, I switched to a decently pricey webcam after doing some research for whenever I am WFH and the image quality for streaming video is very close to my Canon's. There are some tuning advantages the DSLR has that obviously the webcam doesn't give you so it will never be able to match it perfectly IMO but it is far superior to any of my laptop webcams and a far more convenient substitute.