That's because in most of the industries you are thinking of, you can get traditional financing.
The need for an exit of some sort follows from the financial structure.
I'm just confused by two interlinked things. The terminology of "exit" and the implicit need for an "exit".
To me, the focus on "exit" does imply moving away from involvement with the business (in how the phrase sounds, and most importantly, in how it seems to be most often used). Which to me signifies a culture built around starting businesses and ultimately around becoming a VC yourself. Doing this is not notable, but presuming it is.
So either "exit" is any kind of large financing, and it doesn't involve "exit" in terms of involvement, in which case the term "exit" is strange to me.
Or "exit" is selling control and does imply "exit" in terms of involvement, in which case it's interesting that this is presumed to be the goal of starting a profitable business.
It seems in practice to be just jargon that covers both, but more the latter.