At the same time I've prefaced all my comments on such devices with "widespread" and "commercial use" ~ they just aren't showing up where people do real work these days.
I can think of several situations where you'd want them however. Out where you don't have electricity.
The claim was that someone's father bought a bunch of brand new manual typewriters in the 1970s. I simply asked what the nature of the business was.
Yours were the only significant claims in this discussion. A couple of factual claims pertinent to the topic. Those claims, evidently based upon generalizations of your own personal experience are thoroughly rebutted by linked and abstracted citations of typewriter history and databases.