Well, this is not easy. Some of us publishing techs who remember the old times long for a return to the times of the fixed paper page, when ink on paper never changed
No, not really, not on my part. As an ebook creator in a professional capacity, and an avid ebook reader, as you probably gather, I am very concerned that our readers shall get the best ebooks that it is in my power to create.
The responses from experts such as you guys carry a lot of weight, and I won't ignore them. I'm currently looking into how to isolate books which would not need embedded fonts in our workflow, and also how to isolate certain glyphs which might need an embedded font (or an image, which opens another rather large can of worms). That's a tough one, BTW.
What do you think about a clause on the colophon page saying something like "Please give feedback about technical quality to <email address>"? Is it defeatist, or a good thing? I have never seen neither publishers nor self-publishers use it, but I've given feedback nonetheless at times