I've tried consuming podcasts on a number of occasions. I've utterly failed at finding a way to appreciate them, even on subjects that interest me. Reading faster than people speak is a factor (much faster) and being able to skim and dive in where I'm interested, ability to bookmark, to cut-and-paste bits for my notes files and so on. Besides reading is a lot easier for me to stay concentrated on the content rather t…
It's possible to do actively of course, I know there are people out there that listen to music without any interruptions. The primary market for podcasts however are likely to be people who are doing something else and passively listening to them. They may focus in on a subject as it's talked about but a lot of the podcast will only be taken in as a distraction from background noise or silence.
Of course this is all guesswork based on my own opinion and use case, a little of how other podcast listeners I know ingest podcasts too