This is a great interview with Bruce! I can’t wait to see his book on LiveView 
Also agree with what was said about authors choosing a publisher vs self-publishing. For me personally the professional editing makes all the difference - reading a technical book is no small undertaking, and as a reader, I only want to commit my time to well written books that enable me to pick up the topic easily and without frustration.
I think there are others who have been bitten by self-published titles in the past too. The added benefit of this for authors (especially new authors) is that people are much more likely to buy their book if they are published with a tech publisher because readers are confident that it will be up to a certain standard. I don’t know what the figures are, but I bet those who publish with a tech publisher sell far more books than those who self-publish, and of course there are all the other benefits that Dave and Bruce mentioned in the interview too, such as being more attractive to conference organisers, in consulting, etc.
(Btw my views about this are not new, I first mentioned this almost a decade ago.)
Bruce, thanks for all the material you produce and I’m not sure how far you’re into the LiveView book, but if you could I’d love to see info on how to use LV for things like ‘live’ notifications (a bit like the notifications system we have on the forum here).